JP5862777B2 - Traffic information providing system and traffic information providing method - Google Patents

Description

The present invention relates to a traffic information providing system and a traffic information providing method for providing road traffic information.
This application is based on Japanese patent applications filed on July 11, 2012: (1) Japanese Patent Application No. 2012-155229, (2) Japanese Patent Application No. 2012-155230, (3) Japanese Patent Application No. 2012-155231, (4) For designated countries that claim priority based on Japanese Patent Application No. 2012-155232 and (5) Japanese Patent Application No. 2012-155233, and which are permitted to be incorporated by reference to the literature, the contents described in the above application are referred to It is incorporated into the application and is part of the description of this application.

  With regard to technology for information communication between an in-vehicle terminal mounted on a vehicle and a portable terminal carried by a pedestrian, if it is determined that the pedestrian is stopped, the location information from the portable terminal A technique for reducing the power consumption of a portable terminal by reducing the frequency of communication by not performing transmission is known (see Patent Document 1).

JP 2011-227773 A

  However, according to the conventional technology, since the position of the pedestrian is always detected in order to determine whether or not the pedestrian is stopped, there is a problem that power consumption increases.

  The problem to be solved by the present invention is to reduce the power consumption of the mobile terminal device when providing traffic information including the movement of a mobile object other than the host vehicle.

  The present invention determines whether or not a terminal device exists within a position detection area including a specific intersection based on the communication status, causes the terminal device existing within the position detection area to detect position information, The above-mentioned problem is solved by determining whether or not the information exists within the information transmission area set with reference to the specific intersection, and causing the terminal device existing within the information transmission area to transmit the detected position information to the server.

  According to the present invention, it is possible to collect the position information of the terminal devices existing in the vicinity of the specific intersection even if the position detecting means is not always activated. As a result, in the case of providing traffic information in the vicinity of an arbitrary specific intersection, the power consumption of the mobile terminal device can be reduced.

It is a figure showing the whole traffic information offer system outline. It is a figure which shows the operation example of a traffic information provision system. It is a block block diagram of each apparatus. It is a flowchart for demonstrating the control procedure of the traffic information provision system of this embodiment. It is a figure for demonstrating the position detection area T, the information transmission area P, and the specific intersection S. FIG. It is a figure for demonstrating the positional relationship of the position detection area T, the information transmission area P, and the specific intersection S. FIG. It is a flowchart of the process which calculates an information transmission area according to the moving speed of a moving body. It is a figure which shows the concept of each area set according to the moving speed of a moving body. It is a flowchart of the process which calculates an information transmission area according to the attribute of a moving body. It is a figure which shows an example of each position detection area and information transmission area which are set according to the attribute of a moving body. It is a flowchart of the process which sets an information transmission area according to road information. It is a 1st figure which shows each information transmission area calculated according to road information. It is a 2nd figure which shows each information transmission area calculated according to road information. It is a flowchart of the 1st process which calculates information transmission frequency. It is a flowchart of the 2nd process which calculates information transmission frequency. It is a figure for demonstrating the calculation method of the position and direction with respect to a specific intersection. It is a flowchart of the process which switches the detection method of a present position. It is a flowchart of the correction process of the position of a specific intersection and traffic information. It is a figure which shows an example of the map information M which plotted the positional information acquired from the terminal device in the information transmission area on the basis of a specific intersection.

  A traffic information providing system according to this embodiment will be described with reference to the drawings.

  FIG. 1 is a diagram showing an overall outline of a traffic information providing system 1000. As shown in FIG. 1A, a traffic information providing system 1000 according to this embodiment includes a portable terminal device 100A, an in-vehicle terminal device 100B, a traffic information providing server 200, and a terminal device 300 installed on a road. Have The terminal device 300 installed on the road is a road infrastructure device capable of exchanging information with a vehicle-side device through two-way communication.

  FIG. 1B is a diagram for explaining an example of the operation of the traffic information providing system 1000. As shown in FIG. 1B, the terminal device 100A carried by a pedestrian (school child) and the terminal device 100B mounted on the vehicle receive a signal from a GPS satellite and detect the current position. The traffic information providing server 200 acquires position information detected from the terminal devices 100A and 100B that can exchange information with each other, and generates traffic information. The traffic information providing server 200 stores the generated traffic information and distributes it to the terminal devices 100A and 100B. Specifically, in order to inform the pedestrian of the presence of a vehicle approaching the intersection, a terminal that the pedestrian carries a command to output text or voice with the content “A car is coming. Please be careful.” It can be distributed to the device 100A as traffic information. Similarly, to inform the driver of the vehicle that there are pedestrians (school children) approaching the intersection, say "There are pedestrians. Please be careful." Or "Children are crossing. Please be careful." The text or voice of the content, and a command to output “pedestrian caution”, “heading collision warning”, and “motorcycle caution” can be distributed as traffic information to the terminal device 100B mounted on the vehicle.

  As shown in FIGS. 1A and 1B, each communication device (20, 220, 320) of each device can exchange information with each other via a communication network 400. In addition, the traffic information providing system or each device constituting the traffic is connected to other external devices and constitutes a part of so-called intelligent transport systems (ITS (registered trademark)) and other advanced information communication networks. can do. This ITS (registered trademark) includes VICS (registered trademark) (Vehicle Information and Communication System) and ETC (registered trademark) (Electronic Toll Collection System).

  The communication device 20 (320) of the terminal device 100 (300) of the present embodiment is a wireless communication device that exchanges the traffic information providing server 200 information by electrical communication, electromagnetic wave communication, and acoustic wave communication. Although not particularly limited, the communication device 20 (320) includes a wireless communication network for mobile phones such as 3G, LTE (3.9G), and 4G, and a wireless LAN such as WiMAX (registered trademark) and WiFi (registered trademark). Via any one or more of wireless communication networks and wireless communication networks for intelligent road traffic systems (ITS) such as DSRC (registered trademark) (Dedicated Short Range Communication), beacons and FM broadcasts Communication with the communication device 220 of the traffic information providing server 200 is performed. The communication line network 400 of this embodiment is a communication line network for a mobile phone, a communication line network for a wireless local area network (wireless LAN), and a communication line network for ITS.

  Base stations (including mobile phone base stations, wireless LAN access points, ITS Spots (registered trademark); the same shall apply hereinafter) provided for each communication line network depend on the area to which radio waves and light emitted from each base station There is a communicable area. If the communication device 20 can exchange information (communication) with each base station, it can be determined that the terminal device 100 exists in the communicable area of the base station. That is, in the present embodiment, based on the reception status of the communication device 20, it can be determined whether or not the terminal device 100 including the communication device 20 exists in a predetermined area.

  Hereinafter, the traffic information providing system 1000 will be described with reference to the drawings. FIG. 2 is a block configuration diagram of each device provided in the traffic information providing system 1000.

  As shown in FIG. 2, the portable terminal device 100 </ b> A and the in-vehicle terminal device 100 </ b> B basically have a common configuration, and include a control device 10, a communication device 20, a position detection device 30, and a sensor 50.

  The portable terminal device 100 </ b> A is a computer that includes a control device 10 such as a mobile phone, a smartphone, and a tablet terminal that can be carried with a human and walk with a person, a person who rides a bicycle, and a person who rides a motorcycle.

  The in-vehicle terminal device 100B is a computer that is mounted on a vehicle or a motorcycle and includes a control device 10 such as a navigation device that moves with the vehicle or motorcycle. The in-vehicle terminal device 100B is connected to the in-vehicle vehicle controller 60, the navigation device 70, the output device 80, and the travel support device 90 by a CAN (Controller Area Network) or other in-vehicle LAN, and exchanges information with each other. Note that as the in-vehicle terminal device 100B, a mobile phone, a smartphone, or a tablet-type terminal having a navigation function (position detection function, map display function) can be used.

  The control device 10 according to the present embodiment includes a ROM 12 that stores a program for executing traffic information provision processing, and a CPU 11 as an operation circuit that functions as the control device 10 by executing the program stored in the ROM 12. And a RAM 13 that functions as an accessible storage device. The control device 10 of this embodiment includes a detection control function, a transmission control function, a state determination function, a road attribute determination function, and an area setting function. The control device 10 executes each function according to the control procedure shown in FIG. 3 described later by the cooperation of the software for realizing these functions and the hardware described above.

  FIG. 3 is a flowchart showing a control procedure of the traffic information providing system 1000. Hereinafter, according to the control procedure shown in the flowchart shown in FIG. 3, each structure of the terminal device 100 and the traffic information provision server 200 is demonstrated.

  As shown in FIG. 3, in step 101, the position detection device 30 of the terminal devices 100 </ b> A and 100 </ b> B (hereinafter also collectively referred to as “terminal device 100”) detects the position information of the position where the terminal device 100 exists. .

  The position detection device 30 of the present embodiment has a first position detection function and a second position detection function that are different in position detection methods. The first position detection function detects current position information (position / region) based on the communication status between the communication device 20 and a base station (station) provided in the communication network 400. As described above, the base station has a unique communicable area, and the position (area) of the communicable area can be known in advance. The position detection device 30 acquires the communication status from the communication device 20, and when the communication device 20 is in a state where it can communicate with a base station designated in advance, the terminal device 100 is within the communicable area of the base station. It can be judged that it exists. That is, the communicable area of the base station can be detected as the position (area) where the terminal device 100 exists.

  The accuracy of the position (region) information of the terminal device 100 determined by the first position detection function depends on the size of the communicable area. For this reason, when it is desired to increase the accuracy of the current position of the terminal device 100 (when it is desired to narrow the area indicated as the current position), the current position of the terminal device 100 (based on a combination of communication statuses with a plurality of base stations) Area).

  The second position detection function detects current position information based on reception information of radio waves transmitted from a plurality of positioning satellites. The second position detection function of the position detection device 30 includes a device that receives radio waves from a positioning satellite such as GPS (Global Positioning System), and calculates latitude, longitude, and altitude based on the radio waves received from the positioning satellite. . The positioning method using GPS is not limited, and a method known at the time of filing can be appropriately applied.

  The second position detection function of the present embodiment can acquire position information by a D-GPS (Differential GPS) method that corrects a measurement error due to GPS based on radio waves emitted by the base station. In the second position detection function, a method for obtaining position information based on a signal acquired from GPS is not particularly limited, and a method known at the time of filing can be appropriately used. The first position detection function and the second position detection function in the position detection device 30 can be switched by the control device 10 to be described later. However, in step 101, the first position detection function, that is, based on the communication status. Detect current position. That is, in step 101, the position detection function based on signals received from satellites such as GPS is not activated.

  The position detection device 30 according to the present embodiment activates one of a first position detection function for detecting so-called simple position information and a highly accurate second position detection function based on GPS information to acquire position information. Alternatively, both functions may be activated, and the position information may be acquired by a D-GPS (Differential GPS) method in which measurement errors due to GPS are corrected based on radio waves emitted by the base station. A technique for obtaining one piece of position information based on information obtained by both functions is not particularly limited, and a technique known at the time of filing can be appropriately used.

  Further, the position detection device 30 of the present embodiment has an error area detection function. The error area detection function calculates a range (region) in which the terminal device 100 exists with a predetermined probability or more as an error area based on the detection accuracy of the position information of the first position detection function and / or the second position detection function. . The predetermined probability is arbitrarily set. The position detection device 30 of the present embodiment shows an area in which the possibility that the terminal device 100 exists is determined to be equal to or greater than a predetermined value as a circular error area superimposed on the map information.

  Since the current position determined based on the availability of communication by the first position detection function is determined by a single communicable area or a combination of plural communicable areas, the current position is indicated by a pinpoint (one point) It is difficult. Even when the current position is determined using the second position detection function, the signal received from the satellite generates multipath due to the presence of mountains and buildings, the position of the satellite, and the arrangement between the satellites (positional relationship). Therefore, it is generally said that the GPS ranging accuracy is several hundred meters to several kilometers or more, and it is difficult to pinpoint the current position with a single point.

  The error area detection function of this embodiment searches for a base station with which the communication device 20 can communicate, and calculates a communicable area based on the output of the communicable base station. This is a function of calculating an area in which communicable areas of communicable base stations overlap and the terminal device 100 is predicted to exist with a predetermined probability or more as an error area including an error. In addition, the error area detection function of this embodiment is based on the reception status of signals transmitted from positioning satellites, the number of visible satellites, the arrangement of satellites (variation degree, distance between each satellite), the presence of buildings and mountains, etc. This is a function for calculating the degree of error based on environmental factors, and calculating an area where the terminal device 100 is predicted to exist with a predetermined probability or more as an error area including an error according to the degree of error. In the present embodiment, this error area may be used as the current position in consideration of the existence probability.

  Further, the control device 10 sets the frequency at which the position information of the position detection device 30 is detected higher as the distance from the specific intersection is shorter. Specifically, the control device 10 applies the detection timing defined in advance according to the distance between the position information obtained in the previous detection process and the specific intersection, and causes the position detection device 30 to execute the next detection process. . According to this control, since the position detection is performed with high frequency as the vehicle enters the position detection area and approaches the specific intersection, detailed position information can be obtained in the vicinity of the specific intersection important as traffic information. Rough position information can be acquired at a location away from a specific intersection that is not very important as traffic information. Thereby, since the operation | movement which acquires a positional information in the place away from the specific intersection which is not so important as traffic information can be suppressed, the power consumption of the terminal device 100 can be suppressed.

  Subsequently, in step 102 of the flowchart illustrated in FIG. 3, the control device 10 of the terminal device 100 refers to the area information. The area information of the present embodiment includes a position detection area and an information transmission area (the same applies hereinafter). Although not particularly limited, the area information is associated with the map information M and stored in the database 40 of the terminal device 100, the database 340 of the roadside device 300, the database 240 of the traffic information providing server 200, or each base station of the communication network 400. be able to. The terminal device 100, the roadside device 300, and the traffic information providing server 200 may access their own databases 40, 340, and 240 at a necessary timing to refer to the area information, and other information may be obtained via the communication network 400. You may acquire from the terminal device 100, the roadside apparatus 300, the traffic information provision server 200, and may acquire from each base station of the communication network 400 at the time of communication establishment.

  The specific intersection is an intersection where it is desired to observe the movement of the moving body with respect to the intersection and to generate and provide information on traffic based on the movement of the moving body. Specific intersections that are subject to traffic information include high-traffic roads, roads with poor visibility, roads that require monitoring of traffic conditions, such as roads with high elevation differences and curves, roads with high speed limits, Intersections on roads with many pedestrians, road intersections close to school, etc. can be arbitrarily selected and set. The position information detected within the position detection area is sent to the traffic information providing server 200 and used for generating traffic information.

  The position detection area includes a communication area of a base station provided in a communication network for a mobile phone including a specific intersection, a communication area of a base station provided in a communication network of a wireless local area network including a specific intersection, and a specific It can be set based on any one or more of the communication areas of the base stations provided in the communication line network of the intelligent transportation system including the intersection. Thereby, it can be judged using the function which confirms the communication establishment by the communication apparatus 20 with which the terminal device 100 is provided whether the terminal device 100 is located in a position detection area. As a result, it is possible to determine the timing for starting the position detection device 30 without causing a new processing load.

  The information transmission area is an area within the position detection area and set based on the position of the specific intersection. Specifically, the information transmission area may be a circular or elliptical area centered on the specific intersection. It is good also as a strip | belt-shaped area | region along the road which comprises, and it is good also as a rectangle, a polygon, and other geometric shapes along the shape of the some road extended from a specific intersection. The position information of the set information transmission area and the position information of the specific intersection may be stored in the database 40 in association with the map information M or separately from the map information M, or at a suitable timing at the traffic information providing server 200. It may be acquired from the roadside device 300 or the base station.

  FIG. 4 is a diagram showing an example of area information associated with the map information M. As shown in FIG. The area information shown in FIG. 4 includes preselected specific intersections S1 to S4, position detection areas Ta and Tb set to include these specific intersections S1 to S4, and an information transmission area set based on the specific intersection S1. An example of setting an information transmission area Pa2 set based on Pa1 and a plurality of specific intersections S1 to S4 is shown. The position of the specific intersection S, the position (range) of the position detection area T, and the position (range) of the information transmission area P can be defined by coordinate values such as latitude and longitude.

  FIG. 5 is a diagram for explaining the positional relationship between the position detection area T, the information transmission area P, and the specific intersection S. As shown in FIG. 5, the information transmission area P is defined on the basis of the specific intersection S, and the position detection area T is defined as an area including the information transmission area P. The information transmission area P is defined to include the specific intersection S.

  Subsequently, in Step 103 of FIG. 3, the detection control function of the control device 10 determines whether or not the terminal device 100 exists in the position detection area. Specifically, the control device 10 according to the present embodiment determines whether or not the terminal device 100 exists within the position detection area set to include the specific intersection S selected in advance based on the communication status of the communication device 20. Determine whether. In step 103, the control device 10 returns to step 101 when the terminal device 100 exists outside the position detection area, and proceeds to step 104 when the terminal device 100 exists within the position detection area.

  In step 104, the detection control function of the control device 10 activates the GPS module by the second position detection function of the position detection device 30, and acquires position information based on the signal received from the positioning satellite.

  In step 105, the transmission control function of the control device 10 determines whether or not the terminal device 100 exists within the information transmission area P based on whether or not the position information acquired in step 104 is included in the information transmission area P. Judging. The information transmission area P is an area included in the position detection area T, and is a preset area such as a circular area having a predetermined diameter centered on a specific intersection S selected in advance.

  If the control device 10 of this embodiment determines in step 105 that the terminal device 100 does not exist within the information transmission area, the control device 10 returns to step 104 and repeats position detection. On the other hand, if the control device 10 determines in step 105 that the terminal device 100 exists within the information transmission area, the control device 10 proceeds to step 106.

  In step 106, the control device 10 transmits the position information detected in step 104 to the traffic information providing server 200 via the communication device 20. At this time, the control device 10 can send the speed information, the traveling direction, the acceleration information, the right / left turn information, and the like detected on the terminal device 100 side to the traffic information providing server 200 together with the position information.

  When the state of the terminal device 100 is different, the control device 10 of the present embodiment is based on the determined state of the terminal device 100 from the viewpoint that the position information useful as traffic information is different. An area setting function for setting the information transmission area P is provided. The control device 10 according to the present embodiment performs the area setting process in step 107 in parallel with the position information transmission process described above.

  In the present embodiment, the control device 10 can set area information including a position detection area and an information transmission area according to the state of the terminal device 100 (moving body), for example, the moving speed.

  Although not particularly limited, the control device 10 calculates the moving speed of the terminal device 100 (moving body) based on the change in the position information detected by the position detecting device 30. Of course, the control apparatus 10 can also acquire the moving speed of the terminal device 100 (moving body) from the vehicle speed sensor 50 of a motorcycle / automobile. The control device 10 acquires vibration information from the acceleration sensor 50 included in the terminal device 100, the motorcycle, or the automobile. In the present specification, various sensors such as a vehicle speed sensor, a vibration sensor, and an acceleration sensor included in the terminal device 100 are collectively referred to as sensors, and are described with reference numeral 50. The control device 10 acquires the movement position using the second position detection function (GPS) of the position detection device 30. Note that the position information used in the process of determining the state of the terminal device 100 (moving body) is the position information detected in the previous position information detection process.

  FIG. 6A is a flowchart illustrating a processing procedure for setting area information according to the moving speed of the moving object. As shown in FIG. 6A, in step 121, the control device 10 acquires the temporal change in the position information detected by the position detection device 30 and the moving speed of the terminal device 100 from the vehicle speed sensor 50. In step 122, the control device 10 belongs to the preset speed region A (low speed region), speed region B (medium speed region), or speed region C (high speed region). Judging. The speed regions A to C can be appropriately defined according to the traffic situation of the specific intersection. In step 123, when the moving speed belongs to the speed area A (low speed area), the control device 10 proceeds to step 124, and sets the first position detection area T1 and the first information transmission area P1. In step 125, when the moving speed belongs to the speed region B (medium speed region), the control device 10 proceeds to step 126, and sets the second position detection area T2 and the second information transmission area P2. In step 127, when the moving speed belongs to the speed region C (high speed region), the control device 10 proceeds to step 128 and sets the third position detection area T3 and the third information transmission area P3. At this time, the relationship between the widths of the first to third position detection areas is T1 <T2 <T3, and the relationship between the widths of the first to third information transmission areas is P1 <P2 <P3. That is, the control device 10 sets the position detection area T and the information transmission area P that are smaller (approaching the specific intersection S) as the moving speed of the terminal device 100 (moving body) is lower.

  FIG. 6B is a diagram illustrating an example of a positional relationship between the position detection areas T1, T2, and T3 and the information transmission areas P1, P2, and P3.

  It is preferable to start position detection for a mobile body having a high speed from a point in time that is relatively far from the specific intersection S and send the position information to the traffic information providing server 200. This is because if the moving distance per time is large, the location information may not be uploaded to the traffic information providing server 200 even though the vehicle has passed near the specific intersection S. On the other hand, it is preferable to start position detection at a time when the moving body has a low speed near the specific intersection S and send the position information to the traffic information providing server 200. This is because when the moving distance per time is small, there is no change in the position information detected in a predetermined cycle, and there may be a case where almost duplicate position information is uploaded to the traffic information providing server 200. Although not particularly limited, the control device 10 sets the position detection area T and the information transmission area P so that the area increases as the moving speed of the terminal device 100, that is, the moving speed of the moving body increases. Even if the terminal device is not always operated, the position information of the terminal device existing in an appropriate area corresponding to the state of the terminal device can be collected. Thereby, position detection and position information transmission can be performed in a necessary scene, and position detection and position information transmission are not performed in an unnecessary scene, so that the power consumption of the terminal device 100 can be reduced.

  The control device 10 according to the present embodiment is configured such that the attribute of the moving object (for example, a pedestrian, a bicycle, a motorcycle, or other) determined based on any one or more of the speed, vibration, and position of the terminal device 100. If the object moving means) are different, the position detection area T and the information transmission area P are determined based on the determined attribute of the moving body that moves the terminal device 100 from the viewpoint that the position information useful as traffic information is different. Have an area setting function. The control device 10 according to the present embodiment performs the area setting process of step 107 in parallel with the process of sending the position information to the traffic information providing server 200. The control device 10 determines the attributes of the moving object based on the state information such as the moving speed, vibration, and moving position of the terminal device 100 based on the area information including the position detection area and the information transmission area, and the position according to the determined attribute. A detection area T and an information transmission area P are set.

  As described above, the control device 10 of this embodiment includes a state determination function that determines the state of the terminal device 100. The state of the terminal device 100 includes a moving speed, vibration, and a moving position (road center, lane center, road edge, road shoulder, etc.). The state of the terminal device 100 varies depending on the moving body (carrier) carrying the terminal device 100. For example, a terminal device 100 carried by a person walking, a terminal device 100 carried by a person riding a bicycle, a terminal device 100 carried by a person riding a motorcycle, or a terminal device 100 mounted on a motorcycle, carried by a person riding in a car. The terminal device 100 or the terminal device 100 mounted on the automobile has a different moving speed, vibration state, and moving position. For example, in the case of the terminal device 100 carried by a pedestrian, the moving speed is relatively low, the vibration (acceleration / deceleration) is small, and the moving position is a sidewalk area. If the terminal device 100 is carried by a pedestrian riding a bicycle, the moving speed is medium, the vibration (acceleration / deceleration) is medium, and the moving position is the shoulder of the road (the end of the road). . If the terminal device 100 moves with a motorcycle, the moving speed is relatively fast, the vibration (acceleration / deceleration) is large, and the moving position is the shoulder of the road (the end of the road). If the terminal device 100 moves with the automobile, the moving speed is relatively fast, the vibration (acceleration / deceleration) is large, and the moving position is at the center of the road (lane).

  The control device 10 determines whether the moving body that moves the terminal device 100 from any one of the speed, vibration, and position of the terminal device 100 is a pedestrian, bicycle, motorcycle, or automobile. Or the attribute of the moving body which is objects other than a pedestrian, a bicycle, a motorcycle, and a motor vehicle is judged. Specifically, when the moving speed is relatively low, the vibration (acceleration / deceleration) is small, and the moving position is a sidewalk area, it is determined that the moving body is a human and the moving speed is relatively low. If the vibration (acceleration / deceleration) is moderate and the moving position is the shoulder of the road (the end of the road), the moving body is judged to be a bicycle, and the moving speed is relatively fast. If (acceleration / deceleration) is large and the moving position is the shoulder of the road (the end of the road), the moving body is judged to be a motorcycle, and the moving speed is relatively fast, and vibration (acceleration / deceleration) If the movement position is at the center of the road (lane), it is determined that the moving body is an automobile. The criteria for determining the moving object are set experimentally in consideration of the accuracy of the sensor 50 and the like. Of course, the person using the terminal device 100 may input the attributes of the moving object (walking / bicycle / motorcycle / automobile).

  When the moving body is a pedestrian, the control device 10 according to the present embodiment sets the first position detection area T1 that is the first area and the second information transmission area P1 that is the second area. When the moving body is a bicycle, the third position detection area T2 having a third area larger than the first area and the fourth information transmission area P2 having a fourth area larger than the second area. When the mobile body is a motorcycle or a car, the fifth position detection area T3 having a fifth area larger than the third area and the sixth area having a sixth area larger than the fourth area are set. Information transmission area P3 is set.

  FIG. 7A is a flowchart illustrating a processing procedure for setting area information according to the attribute of the moving object. As shown in FIG. 7A, in step 131, the control device 10 acquires the position information detected by the position detection device 30, the output from the acceleration sensor 50, and the information output from the vehicle speed sensor 50. In step 132, the control device 10 determines whether the moving object belongs to a pedestrian, a bicycle, a motorcycle, or an automobile based on the acquired information of the various sensors 50. In step 133, when it is determined that the moving body is a pedestrian, the control device 10 proceeds to step 134 and sets the first position detection area T1 and the first information transmission area P1. In step 135, when the control apparatus 10 determines that the moving body is a bicycle, the control apparatus 10 proceeds to step 136, and sets the second position detection area T2 and the second information transmission area P2. In step 137, when the control device 10 determines that the moving body is a motorcycle or a car, the control device 10 proceeds to step 138 and sets the third position detection area T3 and the third information transmission area P3. At this time, the relationship between the widths of the first to third position detection areas is T1 <T2 <T3, and the relationship between the widths of the first to third information transmission areas is P1 <P2 <P3. That is, when the moving body is a pedestrian, the smallest position detection area T and the information transmission area P (approaching the specific intersection S) are set, and when the moving body is a bicycle, the medium position detection area is set. T and the information transmission area P are set, and when the moving body is a motorcycle or an automobile, the widest position detection area T and the information transmission area P are set.

  FIG. 7B shows a position detection area T1 and an information transmission area P1 when the mobile body is a pedestrian, a position detection area T2 and an information transmission area P2 when the mobile body is a bicycle, and a case where the mobile body is a motorcycle / automobile. It is a figure which shows the example of the positional relationship of this position detection area T3 and the information transmission area P3.

  Since the movement speed of the pedestrian is relatively low, it is preferable to start position detection at a point in time near the specific intersection S and send the position information to the traffic information providing server 200. This is because when the moving distance per time is small, there is no change in the position information detected in a predetermined cycle, and there may be a case where almost duplicate position information is uploaded to the traffic information providing server 200. On the other hand, since the moving speed of motorcycles and automobiles is relatively fast, it is preferable to start position detection from a point in time that is relatively far from the specific intersection S and send the position information to the traffic information providing server 200. This is because if the moving distance per time is large, the location information may not be uploaded to the traffic information providing server 200 even though the vehicle has passed near the specific intersection S. Thereby, position detection and position information transmission can be performed in a necessary scene, and position detection and position information transmission are not performed in an unnecessary scene, so that the power consumption of the terminal device 100 can be reduced.

  Furthermore, the control device 10 of the present embodiment, when road attributes such as the speed limit, road shape, and road width of the road on which the terminal device 100 moves are different, from the viewpoint that useful location information is different as traffic information. It has an area setting function for setting the position detection area T and the information transmission area P based on the attribute of the road on which the terminal device 100 moves. The control device 10 can set the area information including the position detection area and the information transmission area according to the road attribute of the road on which the moving body including the terminal device 100 moves.

  For this reason, the control apparatus 10 of this embodiment is provided with a road attribute determination function. The control device 10 according to the present embodiment determines a road attribute including the position information of the terminal device 100 detected by the position detection device 30 with reference to the map information M including the road attribute information. The road attribute information of the present embodiment includes the speed limit of each road, the road width, the width of a sidewalk provided along the road, the road shape, and the height. That is, the map information M includes speed limit information, road width information, sidewalk width information, and road shape information associated with position information (coordinate information) including at least the height of each road. The control device 10 reads the road attribute information of the road including the detected position information (latitude, longitude, height) of the terminal device 100. The control device 10 of the present embodiment also acquires height information as position information of the terminal device 100, and based on the acquired height information, position information (including height information) of the terminal device 100 and road attributes. Since the road attribute is determined by referring to the map information associated with “,” it is possible to identify a road having a common latitude and longitude but different height, such as a three-dimensional intersection road, as another road. Thereby, the attribute of each road can be judged correctly.

  FIG. 8 is a flowchart showing a processing procedure for setting area information according to the attribute of the road on which the terminal device 100 moves. As shown in FIG. 8, in step 141, the control device 10 refers to map information M associated with road attribute information. In subsequent step 142, the control device acquires the road attribute of the road on which the moving body that moves the terminal device 100 travels. The road attribute includes at least one of a road speed limit, a road shape, and a road width. In step 143, the terminal device 100 refers to the area setting rule according to the road attribute. In step 144, the terminal device 100 sets the position detection area T and the information transmission area P based on the road attribute of the road on which the terminal device 100 moves according to the area setting rule.

  In the present embodiment, setting a wider position detection area T and information transmission area P as the road speed limit is faster is defined as an area setting rule according to road attributes. The control device 10 sets the position detection area T and the information transmission area P that are wider (larger in area) as the speed limit on the road on which the terminal device 100 moves is faster (higher). Since the speed of the moving body traveling on the road is predicted to increase as the speed limit on the road is faster (higher), the position detection area T and the information transmission area P are set wider.

  As shown in FIG. 9, the road W along the arrow A direction and the road L along the arrow B are substantially orthogonal and constitute a specific intersection S. The speed limit of the road W along the direction of the arrow A is 50 km / h, and the speed limit of the road L along the direction of the arrow B is 30 km / h. In the present embodiment, the area information 2 that is short in the extending direction (B direction) of the road L having a low speed limit and short in the width direction of the road is set, and in the extending direction (A direction) of the road W having a high speed limit. Area information 1 that is long and long in the width direction of the road is set. As shown in the figure, in the control device 10 of the present embodiment, the length along the A direction in which the road W with a high speed limit extends is along the B direction in which the road L with a low speed limit extends. Area information 1 having a shape longer than the length is set. In the figure, for the sake of concise explanation, the upper conceptual area information including the position detection area T and the information transmission area P is illustrated, but each area can be set based on the same policy. At this time, the information transmission area P may be set to be included in the position detection area T.

  Further, the control device 10 sets a position detection area T and an information transmission area P that have a larger (wider) area as the road width of the road on which the terminal device 100 moves is larger (wider). As the road width is larger (wider), the speed of the moving body traveling on the road tends to increase. Therefore, the position detection area T and the information transmission area P are set wider for the reasons described above.

  From the same viewpoint, the control device 10 has a position detection area with a larger (wide) area as the width of the sidewalk provided along the sidewalk along which the terminal device 100 moves or the sidewalk along which the terminal device 100 moves is larger (wider). T and information transmission area P are set. As the width of the sidewalk is larger (wider), the amount of traffic on the sidewalk or the road along the sidewalk tends to increase, and the number of moving objects that run tends to increase. For the reasons described above, the position detection area T and information A wide transmission area P is set. Thereby, the same effect as the above-mentioned invention can be produced.

  As shown in FIG. 9, the road W along the direction of the arrow A and the road L along the direction of the arrow B are substantially orthogonal and constitute a specific intersection S. The road width of the road W along the arrow A direction is narrower than the road width of the road L along the arrow B direction. In the present embodiment, the area information 2 that is short in the extending direction (B direction) for the road L with a narrow road width and short in the width direction of the road is set, and the extending direction (A direction for the road W with a wide road width is set. ) And area information 1 that is long in the width direction of the road is set. In the control device 10 of the present embodiment, the area along the A direction in which the wide road W extends extends longer than the length along the B direction in which the narrow road L extends. Information 1 (including position detection area T and information transmission area P) is set. The same applies to the sidewalk. In the figure, for the sake of concise explanation, the upper conceptual area information including the position detection area T and the information transmission area P is illustrated, but each area can be set based on the same policy. At this time, the information transmission area P may be set to be included in the position detection area T.

  Moreover, the control apparatus 10 sets the position detection area T and the information transmission area P of the shape along the shape of the road where the terminal device 100 moves. For example, in a crossroad where two roads intersect, circular, elliptical, and cross-shaped area information (including a position detection area T and an information transmission area P) is set so as to include a road extending from the specific intersection S. In addition, as shown in FIG. 10, a T-shaped intersection where two roads intersect includes a substantially triangular area information (including a position detection area T and an information transmission area P) so as to include only a road extending from the specific intersection S. ). That is, the area information (including the position detection area T and the information transmission area P) is set so that the area where the road L does not exist is not included in the B direction in which the road L extends. Furthermore, when the intersecting road has a curvature, area information (including the position detection area T and the information transmission area P) along the curvature is set. As a result, the position detection area T and the information transmission area P can be set so as not to include a portion where no road exists, so position detection and position information transmission are performed in an area where position information as traffic information is unnecessary. Therefore, the power consumption of the terminal device 100 can be reduced.

  As described above, the traffic information providing system 1000 according to the present embodiment sets the position detection area T and the information transmission area P according to the attribute of the road on which the terminal device 100 moves, so that the position detection device 30 is not always activated. However, it is possible to collect the position information of the terminal device 100 existing in an appropriate area according to the road attribute. In addition, the method of setting the position detection area T and the information transmission area P according to the moving speed of the terminal device 100, the attribute of the moving object, or the road attribute described above may be used independently. The above methods may be combined.

  Next, a method for controlling the cycle of transmitting position information performed by the transmission control function of the control device 10 will be described. The control device 10 of the present embodiment is based on the position of the terminal device 100 with respect to the specific intersection S from the viewpoint that the acquisition frequency of position information useful as traffic information varies depending on the position of the terminal device 100 with respect to the specific intersection S. Thus, the cycle (frequency) of transmitting the position information is determined.

  For example, the control device 10 does not move on the road, but calculates the presence direction of the terminal device 100 with respect to the specific intersection S from the viewpoint of suppressing the transmission of the position information of the terminal device 100 existing in a store along the road. If the angle Δθ formed by the direction in which the terminal device 100 is present and the direction in which the road constituting the specific intersection S extends is greater than or equal to a predetermined value, the cycle for transmitting the position information to the traffic information providing server is lengthened. A process of canceling transmission is executed. Thereby, the frequency with which the positional information of the terminal device 100 existing in the store along the road, at home, and in the parking lot, which is not related to the traffic at the specific intersection S, is transmitted to the traffic information providing server 200 can be reduced. As a result, while useful position information is selectively collected, transmission of unnecessary position information can be suppressed, so that power consumption of the terminal device 100 can be reduced.

  In addition, the control device 10 may require attention because a mobile object that exists near the specific intersection S where the road intersects is closer to another mobile object. On the other hand, there are cases in which a moving body that is located far from the specific intersection S has a relatively large distance from the other moving bodies, and it is not necessary to pay attention to the other moving bodies as much as when traveling near the specific intersection. is there. From this point of view, the longer the distance from the specific intersection to the location where the terminal device 100 is, the longer the period for transmitting the location information to the traffic information providing server 200. That is, the shorter the distance from the position information detected from the position with the specific intersection S, the shorter the period for transmitting the position information to the traffic information providing server 200. That is, in a situation where the distance between the moving bodies is far from the specific intersection S and the necessity of sharing the position information with each other is low, the control device 10 has a low frequency in the position information of each moving body (terminal device 100). Is transmitted to the traffic information providing server 200. On the other hand, in a situation where it is desirable that the distance between the moving objects is close to each other and the position information between the moving objects is close to each other and it is desirable to share each other's position information, the control device 10 frequently acquires the position information of each moving object (terminal device 100). It is transmitted to the traffic information providing server 200. As a result, while transmitting useful position information selectively, transmission of unnecessary position information can be suppressed, so that power consumption of the terminal device 100 can be reduced.

  The control device 10 approaches the specific intersection S from the viewpoint that the faster the moving speed of the terminal device 100 approaching the specific intersection S where the road intersects, the greater the change in the distance between the moving bodies and the possibility of approaching rapidly. The faster the moving speed of the terminal device 100 is, the shorter the cycle for transmitting the position information to the traffic information providing server 200 is. As a result, in a situation where it is desirable for the moving body to approach the specific intersection S at a high speed and to share the position information of each other, the control device 10 frequently transmits the position information of each moving body (terminal device 100) to the traffic. The information is sent to the information providing server 200. As a result, while collecting useful position information selectively, it is possible to suppress the collection of unnecessary position information, so that the power consumption of the terminal device 100 can be reduced.

  On the other hand, from the viewpoint that the position information of the terminal device 100 that stops or moves at a low speed is not useful as traffic information, the control device 10 determines that when the moving speed of the terminal device 100 is less than a predetermined value or zero, Increase the period for sending location information to the server. From the same point of view, when the time during which the moving speed of the terminal device 100 is less than or equal to a predetermined value is equal to or longer than the predetermined time, it can be determined that the terminal device 100 is in a stopped state. When the terminal device 100 is stopped, the traffic in the vicinity of the specific intersection S is not affected. Therefore, the process of transmitting the position information to the traffic information providing server 200 is stopped. Furthermore, from the same point of view, when the terminal device 100 is separated from the specific intersection S, it can be determined that the mobile body is not involved in the traffic of the specific intersection S, so that the process of transmitting location information to the traffic information providing server 200 To cancel. As a result, the position information of the moving body that is not involved in the traffic at the specific intersection S, such as a moving object that has been stopped for a predetermined time or more, or a moving object that is moving away from the specific intersection S, is transmitted to the traffic information providing server 200. Can be suppressed. As a result, while collecting useful position information selectively, it is possible to suppress the collection of unnecessary position information, so that the power consumption of the terminal device 100 can be reduced.

  Returning to the flowchart of FIG. 3, the communication frequency setting process in step 108 will be described. The control device 10 of the present embodiment performs a communication frequency setting process (step 108) in parallel with the position information transmission process described above. Hereinafter, a specific control procedure of the communication frequency changing process will be described based on the flowcharts of FIGS. 11A and 11B.

  First, in step 151, the control device 10 acquires position information S (Cx, Cy) of the specific intersection S. The location information of the specific intersection S may be acquired from a base station that performs communication, may be read from the database 40 provided therein, or may be acquired from the traffic information providing server 200 via the communication network 400. .

  Next, in step 152, the control device 10 activates the second position detection function of the position detection device 30, and acquires the current position Q (Px, Py) of the terminal device 100 by GPS.

  In step 153, the control device 10 calculates the relative position (distance R · direction θ) of the terminal device 100 with respect to the specific intersection S. FIG. 12 shows the distance R and direction θ of the position Q (Px, Py) of the terminal device 100 with respect to the specific intersection S (Cx, Cy).

Although not particularly limited, the distance R · direction θ can be obtained by the equation shown in Equation 1.

  In step 154, the control device 10 sets the transmission frequency according to the distance R of the terminal device 100 with respect to the specific intersection S. The control device 10 sets the transmission frequency for transmitting the position information to be lower (the cycle is longer) as the distance R to the specific intersection S is longer. For example, when the distance R to the specific intersection S is 0 <R ≦ 10 m, the transmission frequency is 1 time / 1 s, and when the distance R is 10 m <R ≦ 20 m, 1 time / 3 s, and the distance R is When 30 m <R, it is set to 1 / 10s.

  In Step 154, the control device 10 sets the transmission frequency according to the direction in which the terminal device 100 is present with respect to the specific intersection S. The control device 10 sets the transmission frequency for transmitting the position information to be lower (the cycle is longer) as the direction θ in which the terminal device 100 exists with respect to the specific intersection S is further away from the angle with respect to the road extending direction. For example, the angle Δθ formed between the direction θ in which the terminal device 100 exists with respect to the specific intersection S and the direction with respect to the road configuring the specific intersection S is equal to or greater than a predetermined value, that is, the road in which the terminal device 100 configures the specific intersection S. If it does not exist, the transmission frequency for transmitting the position information is set low (long period), and the angle Δθ is less than a predetermined value, that is, the terminal device 100 exists on the road constituting the specific intersection S. In this case, the transmission frequency for transmitting the position information is set high (the cycle is shortened). For example, when the angle Δθ with respect to the road constituting the specific intersection S is 0 <θ ≦ 10 degrees, the transmission frequency is 1 time / 1s, and when the angle Δθ is 10 degrees <Δθ ≦ 30 degrees, it is 1 time. / 10 s, and when the angle θ is 30 degrees <Δθ, once / 10 minutes or transmission is stopped.

  In step 155, the control device 10 determines whether or not the terminal device 100 is approaching the specific intersection S (Cx, Cy) based on the history of position information of the terminal device 100. At this time, it may be added to the determination condition of the approach state that the angle Δθ described above is less than a predetermined value. When the terminal device 100 is approaching the specific intersection S, the process proceeds to step 156, and the frequency of transmission of the position information set in step 154 is increased. On the other hand, if the terminal device 100 has not approached the specific intersection S, the process proceeds to step 158, and it is further determined whether or not the terminal device 100 is stopped based on the history of position information of the terminal device 100. If not stopped, the process proceeds to step 159, and the transmission frequency of the position information set in step 154 is lowered. On the other hand, if it is determined in step 158 that the terminal device 100 is stopped, the process proceeds to step 160 and transmission of position information is stopped. After the processing of Steps 156, 159, and 160, the process proceeds to Step 157. When the terminal device 100 is within the information transmission area, control of the transmission frequency is continued, and when the terminal device 100 leaves the information transmission area, transmission is performed. End frequency control.

  FIG. 11B shows another example of the process for controlling the transmission frequency of position information. Steps 161 to 164 in the flowchart shown in FIG. 11B are common to steps 151 to 154 shown in FIG.

  In step 165 shown in FIG. 11B, the control device 10 places the terminal device 100 on the road constituting the specific intersection S (Cx, Cy) based on the position information history of the terminal device 100 and the road position of the map information M. Determine if it exists. At this time, whether or not the terminal device 100 described above is approaching the specific intersection S may be added as a determination condition. If it is determined that the terminal device 100 is moving on the road constituting the specific intersection S, the process proceeds to step 166, and the frequency of transmission of the position information set in step 164 is increased. On the other hand, if the terminal device 100 is not moving on the road that constitutes the specific intersection S, the process proceeds to step 168, and whether or not the terminal device 100 is stopped based on the history of the position information of the terminal device 100 is determined. to decide. If not stopped, the process proceeds to step 169, where the frequency of transmission of the position information set in step 164 is lowered. On the other hand, if it is determined in step 168 that the terminal device 100 is stopped, the process proceeds to step 170 and transmission of position information is stopped. After the processing of Steps 166, 169, and 170, the process proceeds to Step 167. When the terminal device 100 is within the information transmission area, control of the transmission frequency is continued, and when the terminal device 100 leaves the information transmission area, transmission is performed. End frequency control.

  Here, the aspect from which the position detection method of the position detection apparatus 30 differs about the terminal device 100 of this embodiment is demonstrated. Since processes other than the position detection process are common to the processes described above, the description of the terminal device 100 of this example is used.

  As described above, the position detection device 30 according to the present embodiment activates one of the first position detection function for detecting so-called simple position information and the second position detection function with high accuracy based on GPS information. Information can be acquired.

  As described above, the position detection device 30 of the present embodiment has an error area detection function. The error area detection function calculates a range (region) in which the terminal device 100 exists with a predetermined probability or more as an error area based on the detection accuracy of the position information of the first position detection function and / or the second position detection function. . The predetermined probability is arbitrarily set. The position detection device 30 of the present embodiment shows an area in which the possibility that the terminal device 100 exists is determined to be equal to or greater than a predetermined value as a circular error area superimposed on the map information.

  Since the current position determined based on the availability of communication by the first position detection function is determined by a single communicable area or a combination of plural communicable areas, the current position is indicated by a pinpoint (one point) It is difficult. Even when the second position detection function is used, the signal received from the satellite is affected by the occurrence of multipath due to the presence of mountains and buildings, the position of the satellite, and the arrangement (positional relationship) between the satellites. Therefore, it is generally said that the ranging accuracy of GPS is several hundred meters to several kilometers or more, and it is difficult to indicate the current position as a pinpoint (one point).

  The error area detection function of this embodiment searches for a base station with which the communication device 20 can communicate, and calculates a communicable area based on the output of the communicable base station. This is a function for calculating an area in which communicable areas of communicable base stations overlap and the terminal device 100 is predicted to exist as an error area including an error. In addition, the error area detection function of this embodiment is based on the reception status of signals transmitted from positioning satellites, the number of visible satellites, the arrangement of satellites (variation degree, distance between each satellite), the presence of buildings and mountains, etc. This is a function of calculating the degree of error based on environmental factors and calculating an area where the terminal device 100 is predicted to exist according to the degree of error as an error area including an error. In the present embodiment, this error area may be used as the current position in consideration of the existence probability.

  The detection control function of the control device 10 according to the present embodiment includes the first position detection function that detects the position based on the communication status with the base station, the first position detection function that detects the position based on a signal from a satellite such as GPS. The position information can be detected by operating either one of the two position detection functions. That is, the control device 10 can switch the operation of the first position detection function and the second position detection function of the position detection device 30.

  Specifically, the control device 10 is a case where it is determined that the terminal device exists within the above-described position detection area based on the communication status of the communication device 20, and the position information detected by the position detection device 30 or If at least a part of the error area does not overlap the second position detection area set as an area including the specific intersection S within the position detection area, the first position detection function is caused to detect the position information. On the other hand, when the control device 10 determines that the terminal device exists within the position detection area described above, at least a part of the error area detected by the position detection device 30 is within a specific intersection within the position detection area. When overlapping with the second position detection area set as an area including S, the position information detected by the second position detection function is transmitted to the communication means. The “second position detection area” in this process can be an “information transmission area” defined as an area for transmitting position information to be described later.

  This control procedure is shown in the flowchart of FIG. The flowchart of FIG. 13 is basically the same as the flowchart of the terminal device 100 shown in FIG. The difference is that, in step 101, an “error area” is obtained as the current position, and a determination process corresponding to step 105 is executed as step 173 between step 103 and step 104.

  As shown in FIG. 13, first, in step 101, the control device 10 causes the position detection device 30 to detect an “error area” as the current position. The method for calculating the error area is not particularly limited, and a method for calculating an area whose probability of being located is a predetermined value or more, which is known by a name such as “positional accuracy circle” at the time of filing, can be appropriately used. Next, in step 102, the control device 10 refers to the area information. In step 107, if the area information has been changed, the newly set area information is acquired. This area information includes the position of the specific intersection S, the position of the position detection area T, and the position of the information transmission area P. In step 103, the control device 10 determines whether or not the error area overlaps with the position detection area T.

  If the error area overlaps with the position detection area T, the process further proceeds to step 173 to determine whether or not the error area overlaps with the information transmission area P. Whether or not the error area overlaps with the information transmission area P may be determined based on one of the following criteria: when a part overlaps, when a part of a predetermined ratio or more overlaps, or when all overlap. it can. In step 173, when the error area overlaps with the information transmission area P, the process proceeds to step 104, where the second position detection function is activated and position information is acquired using GPS. On the other hand, if the error area does not overlap with the information transmission area P, Step 101 and subsequent steps are repeated without activating the second position detection function, that is, the satellite signal receiving device such as GPS. Thereafter, in step 106, the control device 10 sends the position information acquired by the second position detection function to the traffic information providing server 200 at a predetermined communication frequency. And if the traffic information from the traffic information provision server 200 is received, it will progress to the process after step 109 mentioned later.

  By the way, the accuracy of the position information detected by the first position detection function based on the communication status with the base station is lower than when the second position detection function is used, but the power consumption consumed for the position detection process is Few. On the other hand, the accuracy of the position information detected by the second position detection function based on the signal received from the satellite is higher than when the first position detection function is used, but the power consumption consumed for the position detection process is large. .

  The terminal device 100 in the present embodiment exists in the position detection area, but when the terminal apparatus 100 does not enter the second position detection area close to the specific intersection S, the terminal device 100 has low power consumption even if the position detection accuracy is low. Since the position is detected by the one position detection function, the power consumption of the terminal device 100 can be suppressed. On the other hand, when the terminal device 100 exists in the position detection area and further enters the second position detection area (or information transmission area) near the specific intersection S, the power consumption is high but the position detection accuracy is high. Since the position is detected by the high second position detection function, the accuracy of the position information detected near the specific intersection S can be selectively increased. Thus, since the detection method of position information is switched according to the required accuracy, the power consumed for detection of position information can be reduced.

  As will be described later, when the position information or error area of the terminal device 100 overlaps with the information transmission area, the terminal device 100 needs to send the position information to the traffic information providing server 200. It is preferable to obtain According to this process, in the scene where it is determined whether or not to detect the position, the first position detection function with relatively low accuracy but low power consumption is activated and the position information is sent to the traffic information providing server 200. Then, since the second position detection function with relatively high accuracy is activated, it is possible to reduce the power consumed for the position information detection processing while providing highly accurate position information to the traffic information providing server 200. Can do.

  Next, the traffic information providing server 200 will be described.

  The traffic information providing server 200 according to the present embodiment collects from the terminal device 100, the presence / absence and speed of the moving body passing through the specific intersection S, the presence / absence and speed of the moving body turning right and left at the specific intersection S, and movement in the vicinity of the pedestrian crossing. Traffic information is generated based on the presence and speed of the body. And the traffic information regarding another moving body is distributed to each moving body existing in the vicinity of the specific intersection S. Each mobile unit determines whether another mobile unit enters the specific intersection S, whether the mobile unit makes a right or left turn, or whether there is a pedestrian crossing the specific intersection S according to the traffic information provided. You can know in advance. For this reason, a driver such as a vehicle can make a response according to the movement of another moving body in advance, and a pedestrian can move while paying attention to the presence of the moving body.

  As shown in FIG. 2, the traffic information providing server 200 includes a control device 210, a communication device 220, and a database 240. The communication device 220 exchanges information via the terminal device 100, the roadside device 300, and the communication line network 400. The communication device 220 according to the present embodiment transmits traffic information (described later) generated by the control device 210 to the terminal device 100 or the roadside device 300 that can be connected via the communication network 400. The database 240 stores map information M including road attribute information, area setting information (position detection area position, information transmission area position), specific intersection S position, pedestrian crossing position, roadway position, sidewalk position, and the like. . Information stored in the database 240 can be sent to the terminal device 100 via the communication device 220.

  The control device 210 of the traffic information providing server 200 includes a CPU 211, a ROM 212, and a RAM 213. The control device 210 has a generation function for collecting the location information transmitted by the terminal device 100 and generating the traffic information based on the collected location information. Have. The traffic information includes the position of the specific intersection S, the position of the position detection area, the position of the information transmission area, the position information of the other terminal device 100 (moving body), the speed of the other terminal device 100 (moving body), the other Include the speed of the terminal device 100 (moving body), the moving direction of the other terminal device 100 (moving body), and the attributes of the moving body that moves with the other terminal devices 100 (different from pedestrians, bicycles, motorcycles, and vehicles). be able to. Various information including the position information of the other terminal device 100 (mobile body) included in the traffic information can be associated with the position of the specific intersection S, the position of the position detection area, and the position of the information transmission area.

  In particular, the control device 210 according to the present embodiment corrects location information that is the basis of traffic information in consideration of errors in location information collected from each terminal device 100, and generates traffic information based on the corrected location information. It has a function to do.

  Specifically, the control device 210 according to the present embodiment collects position information detected by the terminal device 100 via the communication device 400 and plots the collected position information on accessible map information. And the road position calculation function for calculating the position of the road based on the position information group plotted on the map information, and the calculated road position and the road position defined on the map information are compared. And a correction amount calculation function for calculating the correction amount of the position information received from the terminal device 100, a generation function, and a transmission control function.

  In general, signals transmitted from positioning satellites such as GPS are affected by the refraction of light in the ionosphere, the number of visible satellites, the arrangement of the satellites, and the multipath caused by the reflection of buildings and mountains. The position measurement accuracy may vary from point to point. That is, a common error may occur in a plurality of pieces of position information measured in the vicinity of a specific intersection S. If the terminal device 100 is traveling on a road, the position information indicates a point on the actual road. The traffic information providing server 200 according to the present embodiment compares the actual road location with a location on the road that is defined in advance on the map information, so that the map information based on the actually measured location information is used. The amount of deviation and the amount of deviation are calculated, and traffic information considering the amount of deviation is generated.

  The control device 210 of the traffic information providing server 200 compares the actual road location with a location on the road defined in advance on the map information, so that the map information based on the actually measured location information Is calculated, and how much the deviation is.

  Then, the control device 210 of the traffic information providing server 200 corrects the position of the specific intersection S, the position of the position detection area, and the position of the information transmission area based on the calculated correction amount of the position information. Traffic information including the position of the specific intersection S, the position of the position detection area, and the position of the information transmission area is generated. The generated traffic information is sent to the terminal device 100 via the communication device 220.

  Further, the control device 210 causes the terminal device 100 to correct (rewrite) the position of the specific intersection S, the position of the position detection area, and the position of the information transmission area based on the calculated correction amount of the position information. Generate traffic information including The traffic information including the generated correction command is sent to the terminal device 100 via the communication device 220.

  As a result, the terminal device 200 detects position information based on the position of the specific intersection S, the position of the position detection area T, and the position of the information transmission area P, which are corrected to match the position detection situation at the current position. Since transmission of position information can be executed, it is possible to suppress detection and transmission of position information that is not useful for traffic information in the vicinity of the specific intersection S. As a result, the power consumption of the terminal device 100 can be reduced.

  The control device 210 according to the present embodiment extracts a line shape from the position information collected from the terminal device 100 and plotted on the map information, and calculates the position of the road from the extracted line shape. Then, the control device 210 calculates the correction amount of the position information received from the terminal device 100 based on the deviation amount between the calculated position of the intersection of the road and the position of the specific intersection S defined on the map information M. calculate. As a result, even if there is a deviation in the actually measured position information, the specific intersection S that allows for the measurement error can be calculated, and the position detection area T and the information transmission area P can be set. Thereby, even if an error is included in the actually measured position information, the terminal device 100 near the specific intersection S can be accurately selected. As a result, it is possible to suppress the terminal device 100 other than the vicinity of the specific intersection S from detecting and transmitting position information, and to reduce the power consumption of the terminal device 100.

  In the correction of the position information, the control device 210 according to the present embodiment calculates the position of the road from the position information of the terminal device 100 having a high moving speed from the viewpoint of determining the correction amount based on the position of the road in the road. Specifically, the control device 210 of the traffic information providing server 210 acquires the movement speed together with the position information from the terminal apparatus 100, collects the position information and movement speed detected by the terminal apparatus 100, and collects the collected position information and movement. Corresponding speeds are plotted on accessible map information, and included in the road based on positional information groups associated with moving speeds of a predetermined value or more among the positional information plotted on the map information Calculate the position of the roadway.

  On the other hand, the control device 210 according to the present embodiment calculates the position of the sidewalk from the position information of the terminal device 100 having a low moving speed from the viewpoint of determining the correction amount based on the position of the roadway in the road when correcting the position information. To do. Specifically, the control device 210 of the traffic information providing server 210 acquires the movement speed together with the position information from the terminal apparatus 100, collects the position information and movement speed detected by the terminal apparatus 100, and collects the collected position information and movement. Corresponding speeds are plotted on accessible map information, and included in the road based on positional information groups associated with moving speeds less than a predetermined value among the positional information plotted on the map information Calculate the position of the sidewalk. Incidentally, this sidewalk includes a pedestrian crossing provided on the roadway.

  Accordingly, the correction amount of the position information can be accurately calculated based on the position of the roadway or the position of the sidewalk. Although the roadway and the sidewalk extend in parallel, but their positions are different, it is better to identify the position information of the terminal device 100 moving on the roadway and the movement information of the terminal device 100 moving on the sidewalk on the roadway. The position of the road can be calculated more accurately than not identifying the position information of the moving terminal apparatus 100 and the movement information of the terminal apparatus 100 moving on the sidewalk.

  Further, it is possible to identify the positional information and movement of a moving body (car / motorcycle) moving on a roadway and the positional information and movement of a moving body (pedestrian) moving on a sidewalk, and provide the terminal apparatus 100 with the identified information. it can. That is, according to this process, the information that “the moving body is moving toward the specific intersection S” is referred to as “the pedestrian is moving (on the sidewalk) toward the specific intersection S” or “the vehicle is (on the road)”. Specifically, “moving toward the specific intersection S”. In this way, by identifying the roadway and the sidewalk in the traffic information, it is possible to specifically convey the attributes of the moving object, the place where attention is paid, and the movement of the moving object to the terminal device 100.

  Although not particularly limited, the control device 210 of the present embodiment takes into consideration that the road may include an up lane and a down lane, and that the up or down lane may include a plurality of lanes. A plurality of lanes included in the road based on the position information group whose deviation is less than a predetermined value among the position information plotted on the map information, instead of extracting one linear from the position information scattered on the entire road The position of is calculated. Further, the control device 210 compares the calculated lane position with the lane position defined on the map information, and calculates the correction amount of the position information received from the terminal device 100. Thereby, the positions of a plurality of lanes can be calculated based on the position information group whose deviation (variation) is less than a predetermined value. Thereby, even when a plurality of lanes are included on the road, the position of the specific intersection S can be extracted based on the position information of the terminal device 100, and accurate traffic information can be generated.

  In addition, the control device 210 of the present embodiment has a moving body that turns right and left in the specific intersection S, and an error occurs in the position of the road in consideration of position information of the moving body that turns right and left (does not go straight). For this reason, the position of the road is calculated based on the position information group other than the position information plotted in the specific intersection S among the position information plotted on the map information. The position information plotted in the specific intersection S is the position of the specific intersection S calculated based on the position (latitude / longitude) of the specific intersection S on the preset map information or the actually measured road position. This is position information included in an area at a predetermined distance from (latitude / longitude). This predetermined distance is a distance that defines a range including a pedestrian crossing and a stop line from the center of the intersection.

  Although the position information of the terminal device 100 that turns right and left at the specific intersection S instead of going straight on the specific intersection S tends to deviate from the center of the road or lane, the control device 10 of the present embodiment Since the position of the road is calculated based on the position information excluding the position information included in the area of the predetermined distance from the position (latitude / longitude) of S, the exact position of the road and the exact position of the specific intersection S are obtained. be able to. As a result, accurate traffic information can be generated.

  Returning to FIG. 3, the operation of the traffic information providing server 200 will be described.

  In step 201, the traffic information providing server 200 of the present embodiment receives the position information, speed information, and moving direction (direction) of the moving object (terminal device 100) from the terminal device 100, and plots it on the map information M. Collect information.

  In step 202, the traffic information providing server 200 of the present embodiment generates traffic information based on the collected location information and the like.

  In step 203, the traffic information providing server 200 of the present embodiment, based on the actually collected location information of the terminal device 100, the location of the specific intersection S, the area information (the location of the location detection area T, the information transmission area P). (Including location) and traffic information. This correction method will be described later.

  In step 203, the traffic information providing server 200 of this embodiment transmits the corrected traffic information / specific intersection position and area information (including the position of the position detection area T and the position of the information transmission area P) to the terminal device 100. To do.

  Here, the traffic information / specific intersection position and area information correction processing will be described with reference to the flowchart of FIG.

  As shown in FIG. 14, in step 212, the traffic information providing server 200 of the present embodiment uses the location information collected from the terminal device 100 within a predetermined time in parallel with the processing of step 202 in FIG. Plot on the given coordinates.

  FIG. 15 is a diagram illustrating an example of map information M in which position information acquired from the terminal device 100 in the information transmission area with the specific intersection S as a reference is plotted D11, D12... D1n, D21, D22. Since most of the terminal devices 100 near the specific intersection S move on the roads constituting the specific intersection S, as shown in FIG. 15, the position information is plotted along the roads as D11, D12... D1n, D21, D22. D2n.

  In step 213, the traffic information providing server 200 according to the present embodiment refers to the road information included in the map information M, refers to the position (coordinates) of the road that constitutes the specific intersection S, and identifies from the plotted position information. The alignment along the road that forms the intersection S is extracted.

  For example, when the road information stores that a specific intersection S selected in advance intersects two roads with a cross, the plotted position information indicates alignment along the x-axis and alignment along the y-axis. It is expected that the linearity will be extracted. Therefore, the control device 210 extracts the linear Lx1 and Ly1 or the linear Lx2 and Ly2 that are orthogonal from the position information group, and the line segment that minimizes the sum of the distances from the plot points (plotted coordinates) of each position information. Are extracted from the position information group. A method for extracting the linear Lx1 and Ly1 or the linear Lx2 and Ly2 from the position information group is not particularly limited, and a known method such as a least square method can be appropriately used.

  In addition, there are cases where each road constituting the specific intersection S includes two lanes, up and down. In this case, as shown in FIG. 15, two pairs of linear Lx1 and Ly1 and linear Lx2 and Ly2 are extracted as orthogonal linear pairs. The intersection angle (for example, 90 degrees) between the linear Lx1 and Ly1 and the linear Lx2 and Ly2 is known and can be included in the road information. The linear Lx1 and the linear Lx2 along the x-axis direction are parallel, and the interval (for example, 5 m) between the linear Lx1 and the linear Lx2 is known and can be included in the road information. The same applies to the linear Ly1 and the linear Ly2 along the y-axis direction. Furthermore, the number of lanes of each road is known and can be included in the road information. The control device 210 can extract the alignment along the road information from the position information group by referring to the number of lanes, the lane interval, and the intersection angle included in the road information of the roads constituting the specific intersection S. If the road contains multiple lanes, extract each line so that the deviation of the position information group is the smallest for each line corresponding to each lane, or exist between each line corresponding to each lane It is possible to take a method of extracting each line shape so that the number of position information plots is minimized.

  When the road includes a roadway and a sidewalk, the position information group includes the position information of the terminal device 100 moving on the roadway and the position information of the terminal device 100 moving on the sidewalk. Since information is dispersed, it may be difficult to extract an accurate line. For this reason, in this embodiment, the positional information group A of the terminal device 100A carried by the pedestrian and the positional information group B of the terminal device 100B mounted on the vehicle are identified, and the positional information groups A and B are separately identified. Extract linearity. Thereby, even when there are variations in the number of pedestrians, vehicles, motorcycles, and bicycles (number of plots), the position of the road and the position of the specific intersection S can be accurately estimated. A method for identifying the position information group A of the terminal device 100A carried by the pedestrian and the terminal device 100B mounted on the vehicle is not particularly limited, but the identification information of the terminal device 100 includes the attribute of the moving object (pedestrian, vehicle, motorcycle, bicycle). ) And sending the identification information to the traffic information providing server 200, the traffic information providing server 200 may identify the moving speed calculated from the history of position information transmitted by the terminal device 100. The traffic information providing server 200 may identify the attributes of the moving object (pedestrian, vehicle, motorcycle, bicycle) based on the above.

  The linear intersection extracted from the position information group corresponds to the position of the specific intersection S. In step 214, the traffic information providing server 200 according to the present embodiment calculates a correction amount from a deviation amount between the position of the linear intersection extracted from the position information group and the position of the specific intersection S set in advance.

  As described above, the position information actually detected by the second position detection function of the position detection device 30 may have an error depending on the location. In this case, there is a difference between the actually measured position information and the position information on the map information M. That is, the position of the specific intersection S, the position of the position detection area T, and the position of the information transmission area P, which are used as a reference for controlling the operation of the terminal device 100, are also shifted.

  For this reason, in the present embodiment, actual position information is detected by correcting the position of the specific intersection S, the position of the position detection area T, and the position of the information transmission area P based on the actually measured position information. Perform control suitable for the environment. As a result, the position detection area T and the information transmission area P are corrected to positions that match the detection environment of the position information. Therefore, even if an error occurs in position detection, the terminal device 100 is originally set in the area where position detection is desired. It is possible to cause the terminal device 100 to perform transmission processing in an area where position detection is to be performed and position information is to be transmitted. That is, it is possible to prevent the terminal device 100 from performing position detection in an area where position detection is unnecessary, and to cause the terminal device 100 to perform transmission processing in an area where position information transmission is unnecessary. As a result, the power consumption of the terminal device 100 can be reduced.

  In step 215, the traffic information providing server 200 according to the present embodiment issues a correction command for correcting the position of the specific intersection, the position of the position detection area, and the position of the information transmission area based on the calculated correction amount (deviation amount). It is generated and sent to the terminal device 100.

  In Step 216, the traffic information providing server 200 of the present embodiment corrects the traffic information generated by itself based on the calculated correction amount (deviation amount). As a result, it is possible to provide accurate traffic information by eliminating the influence of position information errors.

  In step 217, the traffic information providing server 200 of the present embodiment executes the output process of storing, presenting, sending, and other traffic information.

  Finally, returning to FIG. 3 again, in step 109, the terminal device 100 uses the corrected traffic information / specific intersection position and area information (including the position of the position detection area T and the position of the information transmission area P) as traffic. Received from the information providing server 200. The terminal device 100 presents the corrected traffic information to the user via the speaker / display, and the location and area information of the specific intersection to be referred to (including the location of the location detection area T and the location of the information transmission area P). Update memory.

  Since this embodiment is configured and operates as described above, the following effects can be obtained.

  (1-1) According to the traffic information providing system 1000 of the present embodiment, it is determined whether the terminal device 100 exists within the position detection area T based on the communication status, and exists within the position detection area T. Since the position detecting device 30 of the terminal device 100 is activated and the communication device 20 of the terminal device 100 existing within the information transmission area P is activated to transmit the position information, the position detecting device 30 is not always activated. However, the position information of the terminal device 100 existing in the vicinity of the specific intersection S can be collected. As a result, when providing traffic information on a road in the vicinity of an arbitrary specific intersection S, the power consumption of the mobile terminal device can be reduced.

  (1-2) According to the traffic information providing system 1000 of this embodiment, the frequency with which the position information of the position detection device 30 is detected is set higher as the distance from the specific intersection is shorter. According to this control, since the position detection is performed with high frequency as the vehicle enters the position detection area and approaches the specific intersection, detailed position information can be obtained in the vicinity of the specific intersection important as traffic information. Rough position information can be acquired at a location away from a specific intersection that is not very important as traffic information. Thereby, since the operation | movement which acquires a positional information in the place away from the specific intersection which is not so important as traffic information can be suppressed, the power consumption of the terminal device 100 can be suppressed.

  (1-3) In this embodiment, the position detection area is provided in the communication area of the base station provided in the communication network for mobile phones including the specific intersection, and in the communication network of the wireless local area network including the specific intersection. Is set based on at least one of the communication area of the base station provided and the communication area of the base station provided in the communication network of the intelligent transportation system including the specific intersection. It is possible to determine whether the terminal device 100 is located using a function of confirming communication establishment by the communication device 20 included in the terminal device 100. As a result, it is possible to determine the timing for starting the position detection device 30 without causing a new processing load.

  (1-4) The traffic information providing server 200 according to the present embodiment generates traffic information based on the position information transmitted by the terminal device 100, and transmits the generated traffic information to the terminal device 100. The attention of those who pass around the intersection S can be alerted.

  (1-5) Since the terminal device 100 includes a portable terminal device 100A that is portable, an in-vehicle terminal device 100B mounted on the vehicle, and an installation-type terminal device 300 provided on the roadside. The position information of vehicles and pedestrians passing through the specific intersection S can be collected, and the traffic information generated by the vehicles and pedestrians passing through the specific intersection S can be distributed. Traffic information can be provided.

  (1-6) Even when the traffic information providing method according to the present invention is used, the same operations and effects as the above-described invention are exhibited.

  (2-1) According to the traffic information providing system 1000 of the present embodiment, it is determined whether the terminal device 100 exists within the position detection area T based on the communication status, and exists within the position detection area T. Since the position detection device 30 of the terminal device 100 is activated and the communication device 20 of the terminal device 100 existing within the information transmission area P is activated to transmit the position information, the position detection device 30 and the communication device 20 are always connected. Even if it is not activated, the position information of the terminal device 100 existing in the vicinity of the specific intersection S can be collected. Moreover, the position information of the terminal device 100 existing in the vicinity of the specific intersection can be sent to the traffic information providing server 200 at an appropriate cycle (frequency) without always operating the communication device 20. As a result, when providing traffic information on a road near an arbitrary specific intersection, the power consumption of the mobile terminal device can be reduced.

  (2-2) According to the traffic information providing system 1000 of the present embodiment, the existence direction θ of the terminal device 100 with respect to the specific intersection S is calculated, and the existence direction θ and the extension direction of the road constituting the specific intersection S are calculated. When the formed angle Δθ is greater than or equal to a predetermined value, the cycle of transmitting the position information to the traffic information providing server 200 is lengthened (the frequency of transmission is reduced). The frequency at which the location information of the terminal device 100 existing in the store, home, or parking lot is transmitted to the traffic information providing server 200 can be reduced. As a result, while useful position information is selectively collected, transmission of unnecessary position information can be suppressed, so that power consumption of the terminal device 100 can be reduced.

  (2-3) According to the traffic information providing system 1000 of the present embodiment, the longer the distance from the specific intersection to the location where the terminal device 100 is, the longer the period for transmitting the position information to the traffic information providing server 200 ( Send less frequently). That is, at a position far from the specific intersection S, the position information of each mobile unit (terminal device 100) is transmitted to the traffic information providing server 200 at a low frequency, and each mobile unit (terminal device) at a high frequency near the specific intersection S. 100) is transmitted to the traffic information providing server 200, so that useful position information can be selectively transmitted, while transmission of unnecessary position information can be suppressed, thereby reducing the power consumption of the terminal device 100. be able to.

  (2-4) According to the traffic information providing system 1000 of the present embodiment, the higher the moving speed of the terminal device 100 approaching the specific intersection, the shorter the cycle for transmitting the location information to the traffic information providing server 200 (transmission) Therefore, in a situation where it is desirable for the mobile body to approach the specific intersection S at a high speed and to share the position information of each other, the control device 10 frequently uses each mobile body (the terminal device 100). ) Position information is transmitted to the traffic information providing server 200. As a result, while collecting useful position information selectively, it is possible to suppress the collection of unnecessary position information, so that the power consumption of the terminal device 100 can be reduced.

  (2-5) According to the traffic information providing system 1000 of the present embodiment, when the time during which the moving speed of the terminal device 100 is less than a predetermined value or zero is a predetermined time or more, the position information is transmitted to the traffic information providing server. Since the processing to be transmitted to the mobile station 200 is stopped, the position information of the mobile body that is not involved in the traffic at the specific intersection S, such as a parked mobile body or a person using a store (pedestrian), is transmitted to the traffic information providing server 200. It can be suppressed. As a result, while collecting useful position information selectively, it is possible to suppress the collection of unnecessary position information, so that the power consumption of the terminal device 100 can be reduced.

  (2-6) According to the traffic information providing system 1000 of this embodiment, when the terminal device 100 is separated from the specific intersection S, the process of transmitting the position information to the traffic information providing server 200 is stopped. It is possible to suppress transmission of position information of a moving body that is not involved in traffic at the specific intersection S to the traffic information providing server 200 like a moving body that is moving away from the intersection S. As a result, while collecting useful position information selectively, it is possible to suppress the collection of unnecessary position information, so that the power consumption of the terminal device 100 can be reduced.

  (2-7) The traffic information providing server 200 of the present embodiment generates traffic information based on the position information transmitted by the terminal device 100, and transmits the generated traffic information to the terminal device 100. The attention of those who pass around the intersection S can be alerted.

  (2-8) Since the terminal device 100 includes a portable terminal device 100A that is portable, an in-vehicle terminal device 100B that is mounted on a vehicle, and an installation-type terminal device 300 that is provided on the roadside. Since it is possible to collect the position information of vehicles and pedestrians passing through the specific intersection S, and to distribute the traffic information generated to vehicles and pedestrians passing through the specific intersection S without any omission, the specific intersection S It is possible to provide surrounding traffic information.

  (3-1) According to the traffic information providing system 1000 of the present embodiment, it is determined whether the terminal device 100 exists within the position detection area T based on the communication status, and exists within the position detection area T. The position detection device 30 of the terminal device 100 is activated, and further, the communication device 20 of the terminal device 100 existing within the information transmission area P is activated to transmit the position information, and the state of the terminal device 100 is determined and determined. Since the position detection area T and the information transmission area P are set based on the state of the terminal device 100, the terminal device existing in an appropriate area according to the state of the terminal device without always operating the position detection means. Location information can be collected. As a result, when providing traffic information on a road near an arbitrary specific intersection, the power consumption of the mobile terminal device can be reduced.

  (3-2) According to the traffic information providing system 1000 of the present embodiment, the area of the position detection area T and the information transmission area P is set to increase as the moving speed of the terminal device 100 increases. Even though a fast moving body has passed the vicinity of the specific intersection S, the position information is not uploaded to the traffic information providing server 200, and a moving body having a low speed has no change in the detected position information. It is possible to prevent the traffic information providing server 200 from being uploaded. As described above, position detection and position information transmission can be performed in a necessary scene, and position detection and position information transmission are not performed in an unnecessary scene, so that power consumption of the terminal device 100 can be reduced.

  (3-3) The traffic information providing server 200 of the present embodiment sets the position detection area T and the information transmission area P that are the smallest (approaching the specific intersection S) when the moving body is a pedestrian, and moves When the body is a bicycle, a medium position detection area T and information transmission area P are set. When the mobile body is a motorcycle or a car, the widest position detection area T and information transmission area P are set. For pedestrians with relatively slow moving speeds, it is possible to prevent duplicate position information from being uploaded to the traffic information providing server 200, and for motorcycles and cars with high moving speeds to pass near the specific intersection S. It is possible to prevent the location information from being uploaded to the traffic information providing server 200. Thereby, position detection and position information transmission can be performed in a necessary scene, and position detection and position information transmission are not performed in an unnecessary scene, so that the power consumption of the terminal device 100 can be reduced.

  (3-4) In the traffic information providing server 200 according to the present embodiment, the moving body that moves the terminal device 100 is any object such as a pedestrian, a bicycle, a motorcycle, or an automobile based on input information that the terminal device 100 receives from a user. The position detection area T and the information transmission area P according to the exact attributes can be set by determining the attributes of the moving object such as being a pedestrian, bicycle, motorcycle, or an object other than an automobile. Therefore, the above effects can be achieved.

  (3-5) The traffic information providing server 200 according to the present embodiment generates traffic information based on the position information transmitted by the terminal device 100, and transmits the generated traffic information to the terminal device 100. The attention of those who pass around the intersection S can be alerted.

  (3-6) Since the terminal device 100 includes a portable terminal device 100A that is portable, an in-vehicle terminal device 100B mounted on the vehicle, and an installation-type terminal device 300 provided on the roadside. The vehicle and pedestrian location information passing through the specific intersection S can be collected without omission, and the traffic information generated by the vehicle and pedestrian passing through the specific intersection S can be distributed without omission. Traffic information around the intersection S can be provided.

  (4-1) According to the traffic information providing system 1000 of the present embodiment, it is determined whether the terminal device 100 exists within the position detection area T based on the communication status, and exists within the position detection area T. The position detection device 30 of the terminal device 100 is activated, and the communication device 20 of the terminal device 100 existing within the information transmission area P is activated to transmit the position information, and the attribute of the road on which the terminal device 100 moves is determined. Since the position detection area T and the information transmission area P are set based on the determined road attribute, the position detection area T and the information transmission area P are set according to the attribute of the road on which the terminal device 100 moves. Even if the position detection device 30 is not always activated, the position information of the terminal device 100 existing in an appropriate area corresponding to the attribute of the road can be collected.

  (4-2) According to the traffic information providing system 1000 of the present embodiment, the area of the position detection area T and the information transmission area P is set to be larger as the speed limit of the road on which the terminal device 100 moves is faster. Therefore, since the moving speed of the moving body is high, the position information is not uploaded to the traffic information providing server 200 even though the vicinity of the specific intersection S is passed, and the overlapping position information is generated because the moving speed of the moving body is low. It is possible to prevent the traffic information providing server 200 from being uploaded. As described above, position detection and position information transmission suitable for the road conditions caused by the road speed limit can be performed, and position detection and position information transmission are not performed in unnecessary scenes. Consumption can be reduced.

  (4-3) According to the traffic information providing system 1000 of the present embodiment, the area of the position detection area T and the information transmission area P is set larger as the road width of the road on which the terminal device 100 moves is larger. . As the road width is larger (wider), the speed of the moving object traveling on the road tends to increase. According to the present embodiment, since position detection and position information transmission can be performed in consideration of traffic conditions caused by the road width, position detection and position information transmission are not performed in unnecessary scenes. The power consumption of the terminal device 100 can be reduced.

  (4-4) According to the traffic information providing system 1000 of this embodiment, the area of the position detection area T and the information transmission area P is set to be larger as the width of the sidewalk on which the terminal device 100 moves is larger. . As the width of the sidewalk is larger (wider), the traffic volume on the sidewalk or the road along the sidewalk tends to increase, and the number of moving bodies that run tends to increase. According to the present embodiment, since position detection and position information transmission can be performed in consideration of traffic conditions caused by the width of the sidewalk, position detection and position information transmission are not performed in unnecessary scenes. The power consumption of the terminal device 100 can be reduced.

  (4-5) According to the traffic information providing system 1000 of the present embodiment, the position detection area T and the information transmission area P having a shape along the shape of the road on which the terminal device 100 moves are set. As a result, the position detection area T and the information transmission area P can be set so as not to include a portion where no road exists, so position detection and position information transmission are performed in an area where position information as traffic information is unnecessary. Therefore, the power consumption of the terminal device 100 can be reduced.

  (4-6) According to the traffic information providing system 1000 of this embodiment, the terminal device 100 determines the attribute of the road based on the height information of each road. A road that is common but has a different height can be identified as another road. Thereby, the attribute of each road can be judged correctly.

  (4-7) According to the traffic information providing system 1000 of the present embodiment, the area of the position detection area T and the information transmission area P is set to increase as the moving speed of the terminal device 100 increases. Even though a fast moving body has passed the vicinity of the specific intersection S, the position information is not uploaded to the traffic information providing server 200, and a moving body having a low speed has no change in the detected position information. It is possible to prevent the traffic information providing server 200 from being uploaded. As described above, position detection and position information transmission can be performed in a necessary scene, and position detection and position information transmission are not performed in an unnecessary scene, so that power consumption of the terminal device 100 can be reduced.

  (4-8) The traffic information providing server 200 according to the present embodiment generates traffic information based on the position information transmitted by the terminal device 100, and transmits the generated traffic information to the terminal device 100. The attention of those who pass around the intersection S can be alerted.

  (4-9) Since the terminal device 100 includes a portable terminal device 100A that is portable, an in-vehicle terminal device 100B that is mounted on a vehicle, and an installation-type terminal device 300 that is provided on the roadside. The vehicle and pedestrian location information passing through the specific intersection S can be collected without omission, and the traffic information generated by the vehicle and pedestrian passing through the specific intersection S can be distributed without omission. Traffic information around the intersection S can be provided.

  (4-10) Even when the traffic information providing method according to the present invention is used, the same operations and effects as the above-described invention are exhibited.

  (5-1) In the traffic information providing system 1000 of the present embodiment, the traffic information providing server 200 is defined on the map information and the position of the road calculated based on the position information group plotted on the map information. A correction amount of position information is calculated by comparing with the position of the road, and traffic information including the position of the specific intersection corrected based on the correction amount, the position of the position detection area, and the position of the information transmission area is generated. For this reason, even if an error occurs in the actually measured position information due to various measurement conditions, the position of the specific intersection where the measurement error is expected (considering the measurement error), the position of the position detection area, And the position of the information transmission area is calculated, and the traffic information including these is transmitted to the terminal device 100. Therefore, the terminal device 100 anticipates the measurement error (considering the measurement error), the position of the specific intersection, and the position of the position detection area And, detection of position information and transmission of position information can be executed based on the position of the information transmission area. That is, it is possible to suppress detection and transmission of position information that is not useful for traffic information in the vicinity of the specific intersection S. As a result, the power consumption of the terminal device 100 can be reduced.

  (5-2) The traffic information providing system 1000 according to the present embodiment detects the position based on the corrected position of the position detection area T (allowing for measurement error) when the terminal device 100 acquires the traffic information. Since the position information is detected by the device 30 and the position information is transmitted to the communication device 20 based on the corrected position of the information transmission area P (allowing for measurement error), it is useful for traffic information in the vicinity of the specific intersection S. It is possible to suppress detection and transmission of no position information. As a result, the power consumption of the terminal device 100 can be reduced.

  (5-3) In the traffic information providing system 1000 according to the present embodiment, the terminal device 100 extracts a line shape from position information plotted on the map information M, calculates a road position from the extracted line shape, and is calculated. Since the correction amount is calculated based on the amount of deviation between the position of the intersection of the road and the position of the specific intersection S defined on the map information M, there is a deviation in the actually measured position information. Even if it exists, the specific intersection S which anticipated the measurement error can be calculated, and the position detection area T and the information transmission area P can be set. Thereby, even if an error is included in the actually measured position information, the terminal device 100 near the specific intersection S can be accurately selected. As a result, since the terminal device 100 other than the vicinity of the specific intersection S is not caused to detect and transmit position information unnecessarily, the power consumption of the terminal device 100 can be reduced.

  (5-4) The traffic information providing system 1000 according to the present embodiment includes a position information group associated with a moving speed of a predetermined value or more among the position information plotted by the traffic information providing server 200 on the map information M. Based on this, the position of the roadway included in the road is calculated, so that the correction amount of the position information can be accurately calculated based on the position of the roadway. By identifying the roadway on the road, the attributes of the moving body in the traffic information, the place where attention is paid, and the movement of the moving body can be made concrete. “The vehicle is moving toward the specific intersection S (on the roadway) ”Can be transmitted to the terminal device 100.

  (5-5) The traffic information providing system 1000 according to the present embodiment includes a position information group associated with a moving speed less than a predetermined value among the position information plotted by the traffic information providing server 200 on the map information M. Based on the position of the sidewalk included in the road, the correction amount of the position information can be accurately calculated based on the position of the sidewalk. By identifying the sidewalk on the road, the attributes of the moving body in the traffic information, the place to pay attention to, and the movement of the moving body can be made concrete. “Pedestrians move (to the sidewalk) toward the specific intersection S Specific traffic information such as “medium” can be transmitted to the terminal device 100.

  (5-6) The traffic information providing system 1000 according to the present embodiment includes line segments that are substantially parallel to each other based on the position information plotted on the map information M by the traffic information providing server 200. The position of the line segment extracted so as to minimize the number of position information plotted during the period is calculated as the positions of a plurality of lanes included in the road, and the correction amount is calculated based on the positions of the lanes. Therefore, even when the road includes a plurality of lanes, the position of the specific intersection S can be extracted based on the position information of the terminal device 100, and accurate traffic information can be generated.

  (5-7) The traffic information providing system 1000 according to the present embodiment is included in the road based on a positional information group whose deviation is less than a predetermined value among the positional information plotted on the map information M by the traffic information providing server 200. The position of the plurality of lanes is calculated, and the correction amount is calculated based on the position of the lane. Therefore, even when the road includes a plurality of lanes, the specific intersection S based on the position information of the terminal device 100 is calculated. Can be extracted and accurate traffic information can be generated.

(5-8) The traffic information providing system 1000 according to this embodiment includes a position information group other than the position information plotted in the specific intersection S among the position information plotted on the map information M by the traffic information providing server 200. Since the position of the road is calculated based on the position information of the terminal device 100 that turns right and left at the specific intersection S, the position of the road is calculated based on the position information excluding the position information. The position of S can be determined. As a result, accurate traffic information can be generated.
Specially

  (5-9) Since the terminal device 100 includes a portable terminal device 100A that is portable, an in-vehicle terminal device 100B mounted on the vehicle, and an installation-type terminal device 300 provided on the roadside. The vehicle and pedestrian location information passing through the specific intersection S can be collected without omission, and the traffic information generated by the vehicle and pedestrian passing through the specific intersection S can be distributed without omission. Traffic information around the intersection S can be provided.

  (5-10) Even when the traffic information providing method according to the present invention is used, the same operations and effects as the above-described invention are exhibited.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  That is, in this specification, a terminal including a portable terminal device 100A, an in-vehicle terminal device 100B, and an installed terminal device 300 as one aspect of a traffic information providing system including the terminal device and the server according to the present invention. A traffic information providing system 1000 including the device 100 and the traffic information providing server 200 will be described as an example, but the present invention is not limited to this.

  In the present specification, as one aspect of a terminal device including a communication unit, a position detection unit, a detection control unit, and a transmission control unit according to the present invention, a communication device 20, a position detection device 30, and a detection control are provided. The terminal device 100 including the control device 10 having the function and the transmission control function, the database 40, and the sensor 50 will be described as an example, but the present invention is not limited to this.

  Further, in the present specification, as one aspect of the terminal device including the detection control unit, the transmission control unit, the state determination unit, the road attribute determination unit, and the area setting unit according to the present invention, a detection control function, a transmission control function, The terminal device 100 including the control device 10 that executes the state determination function, the road attribute determination function, and the area setting function will be described as an example, but the present invention is not limited to this.

  In this specification, a first position detection function, a second position detection, and the like are provided as an aspect of a position detection unit that includes a first position detection unit, a second position detection unit, and an error area detection unit included in the terminal device according to the present invention. The position detection device 30 having functions and error area detection functions will be described as an example, but the present invention is not limited to this.

  In the present specification, as an aspect of a server including a generation unit and a server-side transmission control unit according to the present invention, a control device 210 having a generation function and a transmission control function, a communication device 220, and a database 240 are provided. The traffic information providing server 200 provided will be described as an example, but the present invention is not limited to this.

  In the present specification, as one aspect of a server including a position information collection unit, a road position calculation unit, a correction amount calculation unit, a generation unit, and a server-side transmission control unit according to the present invention, a position information collection function, The traffic information providing server 200 including the control device 210 that executes the road position calculation function, the correction amount calculation function, the generation function, and the transmission control function will be described as an example, but the present invention is limited to this. It is not a thing.

1000 ... Traffic information provision system
100, 100A, 100B ... Terminal device 10 ... Control device 11 ... CPU
12 ... ROM
13 ... RAM
DESCRIPTION OF SYMBOLS 20 ... Communication apparatus 30 ... Position detection apparatus 40 ... Database 50 ... Sensor 200 ... Traffic information provision server 210 ... Control apparatus 211 ... CPU
212 ... ROM
213 ... RAM
220 ... Communication device 230 ... Position detection device 240 ... Database 300 ... Roadside device 320 ... Communication device 240 ... Database 350 ... Sensor

Claims (40)

A traffic information providing system comprising a server and a terminal device capable of communicating with the server,
The terminal device
A communication means for exchanging information with the server via a communication network;
Position detecting means for detecting current position information;
Based on the communication status of the communication means, if it is determined that the terminal device exists within a position detection area set to include a specific intersection selected in advance, the position detection means is caused to detect position information. Detection control means;
When it is determined that the terminal device exists within the information transmission area that is included in the position detection area and set based on the specific intersection selected in advance based on the detected position information, And a transmission control means for causing the communication means to transmit the detected position information to the server.   The traffic information providing system according to claim 1, wherein the detection control unit increases the frequency with which the position detection unit detects position information as the distance from the specific intersection is shorter.   The location detection area includes a communication area of a base station provided in a communication line network for a mobile phone, a communication area of a base station provided in a communication line network of a wireless local area network, and a communication line network of an intelligent transportation system The traffic information providing system according to claim 1, wherein the traffic information providing system is set based on any one or more of communication areas of base stations provided in the network. The server collects the positional information transmitted by the terminal device, and generates traffic information based on the collected positional information;
The traffic information provision according to any one of claims 1 to 3, further comprising server-side transmission control means for transmitting the generated traffic information to the terminal device via the communication line network. system.   The terminal device includes a portable terminal device that is portable, a vehicle-mounted terminal device mounted on a vehicle, and an installation-type terminal device provided on a roadside. The traffic information providing system according to any one of the above. In a terminal device having a function of communicating with a server via a communication network and a function of detecting position information,
Determining whether the terminal device exists within a position detection area set to include a specific intersection selected in advance based on the communication status of the terminal device; and
When it is determined that the terminal device is present within the position detection area, starting the function of detecting the position information in the terminal device;
Determining whether the detected position information is within the position detection area and within the information transmission area set with reference to the specific intersection; and
When it is determined that the terminal device is present within the information transmission area, the function of performing the communication is activated and the detected position information is transmitted to the server. To provide traffic information.   2. The traffic information providing system according to claim 1, wherein the transmission control unit controls a cycle of transmitting the position information based on the detected position of the terminal device with respect to the position of the specific intersection.   The transmission control means calculates the existence direction of the terminal device with respect to the specific intersection, and when an angle formed by the existence direction and the extending direction of a road constituting the specific intersection is a predetermined value or more, The traffic information providing system according to claim 7, wherein a period for transmitting the position information to the server is lengthened.   The traffic according to claim 7 or 8, wherein the transmission control means lengthens a cycle for transmitting the position information to the server as the distance between the specific intersection and the location of the terminal device is longer. Information provision system.   The said transmission control means shortens the period which transmits the said positional information to the said server, so that the moving speed of the said terminal device which approaches the said specific intersection is high. The traffic information provision system described in 1.   The transmission control means, when the time during which the moving speed of the terminal device is less than a predetermined value or zero is a predetermined time or more, stops the process of transmitting the position information to the server. The traffic information providing system according to any one of Items 7 to 10.   The said transmission control means stops the process which transmits the said positional information to the said server, when the said terminal device leaves | separates from the said specific intersection, The Claim 1 characterized by the above-mentioned. Traffic information provision system. The server collects the positional information transmitted by the terminal device, and generates traffic information based on the collected positional information;
The traffic information provision according to any one of claims 7 to 12, further comprising server-side transmission control means for transmitting the generated traffic information to the terminal device via the communication line network. system.   The traffic information providing system according to any one of claims 7 to 13, wherein the terminal device includes a portable terminal device that is portable, and a stationary terminal device that is provided on a roadside. A state determining means for determining a state of the terminal device;
The traffic information providing system according to claim 1, further comprising area setting means for setting the position detection area and the information transmission area based on the determined state of the terminal device. The state determination means determines a moving speed of the terminal device,
The traffic information providing system according to claim 15, wherein the area setting unit sets the area of the position detection area and the information transmission area to increase as the moving speed of the terminal device increases. In the state determination means, the moving body that moves the terminal device from any one of the speed, vibration, and position of the terminal device is any object such as a pedestrian, a bicycle, a motorcycle, or an automobile. Or determining the attribute of the moving object as an object other than a pedestrian, bicycle, motorcycle, and automobile,
The area setting means includes
When the moving body is a pedestrian, set the first position detection area of the first area and the second information transmission area of the second area,
When the moving body is a bicycle, the third position detection area having a third area larger than the first area and the fourth information transmission area having a fourth area larger than the second area Set
When the mobile body is a motorcycle or an automobile, the fifth position detection area having a fifth area larger than the third area and the sixth information having a sixth area larger than the fourth area The traffic information providing system according to claim 15, wherein a transmission area is set. The state determination means determines whether the moving body that moves the terminal device is a pedestrian, a bicycle, a motorcycle, or an automobile, or a pedestrian, a bicycle, a motorcycle, and an automobile based on input information received by the terminal device. Determining the attribute of the moving body as an object other than
The area setting means includes
When the moving body is a pedestrian, set the first position detection area of the first area and the second information transmission area of the second area,
When the moving body is a bicycle, the third position detection area having a third area larger than the first area and the fourth information transmission area having a fourth area larger than the second area Set
When the mobile body is a motorcycle or an automobile, the fifth position detection area having a fifth area larger than the third area and the sixth information having a sixth area larger than the fourth area The traffic information providing system according to claim 15, wherein a transmission area is set. The server collects the positional information transmitted by the terminal device, and generates traffic information based on the collected positional information;
The traffic information provision according to any one of claims 15 to 18, further comprising server-side transmission control means for transmitting the generated traffic information to the terminal device via the communication line network. system.   The traffic information providing system according to any one of claims 15 to 19, wherein the terminal device includes a portable terminal device that is portable and a stationary terminal device that is provided on a roadside. Road attribute determination means for determining the attribute of the road including the position information of the terminal device detected by the position detection means with reference to map information including the road attribute,
2. The traffic information providing system according to claim 1, further comprising area setting means for setting the position detection area and the information transmission area based on the determined road attribute. The road attribute determining means determines a speed limit of a road including the position information of the terminal device with reference to map information including the speed limit of each road,
The traffic information providing system according to claim 21, wherein the area setting means sets the area of the position detection area and the information transmission area to increase as the speed limit of the road increases. The road attribute determining means determines the road width of the road including the position information of the terminal device with reference to map information including the road width of each road,
The traffic information providing system according to claim 21, wherein the area setting means sets the area of the position detection area and the information transmission area to increase as the road width of the road increases. The road attribute determining means is configured to determine a width of a sidewalk provided along the road including the location information of the terminal device or a sidewalk provided along the road including the location information of the terminal device. Judging by referring to map information including road width,
The traffic information providing system according to claim 21, wherein the area setting means sets the area of the position detection area and the information transmission area to increase as the width of the sidewalk increases. The road attribute determining means determines the shape of the road including the position information of the terminal device with reference to map information including the shape of each road,
The traffic information providing system according to claim 21, wherein the area setting means sets the position detection area and the information transmission area having a shape along the shape of the road.   The road attribute determination means acquires height information as the position information of the terminal device, and map information in which the attribute of each road and the height of each road are associated with each other based on the acquired height information The traffic information providing system according to any one of claims 21 to 25, wherein an attribute of a road including position information of the terminal device is determined with reference to FIG.   The area setting means acquires the moving speed of the terminal device, and sets the area of the position detection area and the information transmission area to increase as the moving speed of the terminal device increases. Item 27. The traffic information providing system according to any one of Items 21 to 26. The server collects the positional information transmitted by the terminal device, and generates traffic information based on the collected positional information;
The traffic information provision according to any one of claims 21 to 27, further comprising: server-side transmission control means for transmitting the generated traffic information to the terminal device via the communication line network. system.   The traffic information providing system according to any one of claims 21 to 28, wherein the terminal device includes a portable terminal device that is portable, and a stationary terminal device that is provided on a roadside. In a terminal device having a function of communicating with a server via a communication network and a function of detecting position information,
Determining the attribute of the road including the detected location information of the terminal device with reference to map information including the road attribute;
Based on the determined road attribute, the server includes a position detection area that includes a specific intersection selected in advance and is defined as an area that activates a function of detecting the position of the terminal device, and the detected position information. Setting an information transmission area defined on the basis of the specific intersection as an area to be sent to,
Determining whether the terminal device exists within the set position detection area based on the communication status of the terminal device; and
If it is determined that the terminal device exists within the position detection area, a step of activating a function of detecting the position information;
Determining whether the detected position information is included within a preset information transmission area; and
When it is determined that the terminal device is present within the information transmission area, the function of performing the communication is activated and the detected position information is transmitted to the server. To provide traffic information. The server
Server-side communication means for exchanging information with the terminal device via a communication network;
Position information collecting means for collecting position information detected by the terminal device via the communication means and plotting the collected position information on accessible map information;
Road position calculating means for calculating the position of the road based on the position information group plotted on the map information;
A correction amount calculating means for comparing the calculated road position with the position of the road defined on the map information and calculating a correction amount of the position information received from the terminal device;
Generating means for collecting location information transmitted by the terminal device and generating traffic information based on the collected location information;
Server-side transmission control means for transmitting the generated traffic information to the terminal device via the communication line network,
The generation unit corrects the position of the specific intersection, the position of the position detection area, and the position of the information transmission area based on the correction amount of the position information calculated by the correction amount calculation unit. The traffic information providing system according to claim 1, wherein traffic information including a position of the specific intersection, a position of the position detection area, and a position of the information transmission area is generated. When the traffic information is acquired, the detection control unit of the terminal device causes the position detection unit to detect position information based on the position of the corrected position detection area, and
32. The traffic information according to claim 31, wherein, when the traffic information is acquired, the transmission control unit causes the communication unit to transmit position information based on the position of the corrected information transmission area. Offer system. The road position calculation means extracts a line shape from position information plotted on the map information, calculates a road position from the extracted line shape,
The correction amount calculation means is a correction amount of the position information received from the terminal device based on a deviation amount between the position of the road intersection calculated by the road position calculation means and the position of the specific intersection on the map information. The traffic information providing system according to claim 31 or 32, wherein the traffic information is calculated. The transmission control means of the terminal device causes the communication means to transmit the moving speed of the terminal device together with the position information to the server,
The server location information collecting means collects the location information and the moving speed detected by the terminal device via the communication means, and associates the collected location information with the moving speed on the accessible map information. Plot and
The road position calculation means calculates a position of a roadway included in the road based on a position information group associated with a moving speed equal to or higher than a predetermined value among the position information plotted on the map information. The traffic information providing system according to any one of claims 31 to 33, characterized in that the system is provided. The transmission control means of the terminal device causes the communication means to transmit the moving speed of the terminal device together with the position information to the server,
The server location information collecting means collects the location information and the moving speed detected by the terminal device via the communication means, and associates the collected location information with the moving speed on the accessible map information. Plot and
The road position calculating means calculates a position of a sidewalk included in the road based on a position information group associated with a moving speed less than a predetermined value among the position information plotted on the map information. The traffic information providing system according to any one of claims 31 to 33, characterized in that the system is provided. The road position calculation means is a line segment that is substantially parallel to each other based on the position information plotted on the map information, so that the number of position information plotted between the line segments is minimized. The position of the line segment extracted in is calculated as the position of multiple lanes included in the road,
The correction amount calculating means compares the calculated lane position with a lane position defined on the map information, and calculates a correction amount of the position information received from the terminal device. The traffic information providing system according to any one of claims 31 to 35. The road position calculation means calculates positions of a plurality of lanes included in the road based on a position information group whose deviation is less than a predetermined value among the position information plotted on the map information,
The correction amount calculating means compares the calculated lane position with a lane position defined on the map information, and calculates a correction amount of the position information received from the terminal device. The traffic information providing system according to any one of claims 31 to 35.   The road position calculation means calculates a road position based on a position information group other than the position information plotted in the specific intersection among the position information plotted on the map information. The traffic information providing system according to any one of Items 31 to 37.   39. The traffic information providing system according to any one of claims 31 to 38, wherein the terminal device includes a portable terminal device that is portable and a stationary terminal device that is provided on a roadside. In a terminal device having a function of communicating with a server via a communication network and a function of detecting position information,
Determining whether the terminal device exists within a position detection area set to include a preselected specific intersection based on the communication status of the terminal device; and
When it is determined that the terminal device is present within the position detection area, starting the function of detecting the position information in the terminal device;
Determining whether the detected position information is within the position detection area and within the information transmission area set with reference to the specific intersection; and
When it is determined that the terminal device is present within the information transmission area, a function of starting communication with the server is started, and the detected position information is transmitted to the server.
A server capable of communicating with a terminal device having a function of communicating with a server via a communication network and a function of detecting position information,
Collecting the position information detected by the terminal device and plotting the collected position information on accessible map information;
Calculating the position of the road based on the position information group plotted on the map information;
Comparing the calculated road position and the road position defined on the map information, and calculating a correction amount of the position information received from the terminal device;
Generating traffic information based on the collected location information and a correction amount of the calculated location information;
Transmitting the generated traffic information to the terminal device via the communication line network.

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