JP5273525B2 - Navigation device and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle navigation apparatus capable of appropriately displaying traffic congestion information and improving the visibility of a map itself, in displaying the traffic congestion information. <P>SOLUTION: The road number of a favorable road is acquired (S300), and it is determined whether the vehicle is separated from the present traffic congestion road by a predetermined distance A (for example, 200 m) or longer (S310). When it is not separated by the predetermined distance A or longer (S310: NO), drawing data is written as usually (S330). When it is separated by the predetermined distance A or longer (S310: YES), next, it is determined whether the vehicle is separated by a predetermined distance B(B&gt;A, for example, 400 m) or longer (S320). When it is not separated by the predetermined distance B or longer (S320: NO), the drawing data is written out at a permeability of 50% (S350). When it is separated by the predetermined distance B or longer (S320: YES), the drawing data is written out at a permeability of 80% (S340). <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a display capable of navigation device traffic conditions.

A navigation device generally includes a display device such as a color display device, and the display screen corresponds to a current location mark indicating a vehicle position, a map drawn based on map data, and map data. The information such as the facility stored in the memory is displayed in an overlapping manner.
By the way, in recent years, information centers have been established for the purpose of notifying the driver of traffic conditions that change every moment. From this information center, for example, traffic jam information is distributed. Therefore, some navigation devices display a traffic jam condition corresponding to each road on the map. For example, it is divided into three stages, “congestion”, “congestion”, and “smooth” from the one with the highest degree of congestion, and each is indicated on the map as an arrow of “red”, “yellow”, and “blue”. A navigation device is disclosed (for example, see Patent Document 1).

JP 2003-65778 A

  However, in the related art, although the display / non-display of the arrow indicating the traffic jam condition can be switched at once, all the arrows indicating the traffic jam condition are displayed on the map when the display is selected. As a result, the arrow indicating the traffic situation is complicated, and it is often difficult to recognize the traffic situation.

The present invention has been made to solve the problems described above, and its object is to provide a suppressible navigation device that congestion situation becomes difficult recognized by properly display useful information There is.

Navigation apparatus of the present invention obtains the map data storage means for storing map data, based on the map data stored in the map data storage unit, map display control means for displaying a map, traffic information of a road traffic congestion On the map displayed by the information acquisition unit, the road condition determination unit that determines a road whose degree of congestion exceeds a predetermined standard based on the traffic jam information acquired by the traffic jam information acquisition unit, and the map display control unit Road condition display control means for displaying the traffic condition of each road based on the traffic information, and the road condition display control means is a road that exceeds the standard in a display form according to the arrangement relationship with the road that exceeds the standard. It is characterized by displaying the traffic congestion situation of roads other than.

  That is, a road whose degree of congestion exceeds a predetermined standard is determined, and the congestion status of each road other than the road exceeding the standard is displayed in a display form according to the arrangement relationship with the road. An example of the display of the traffic situation is an arrow display corresponding to a road. Note that the “congestion status” includes, for example, the time required for passing through the traffic congestion section, the average speed of each vehicle in the traffic congestion section, the length of the traffic congestion section, and the like. A road whose degree of congestion exceeds a standard is, for example, a “congested road”. Accordingly, each road other than the road exceeding the standard includes, for example, “smooth road”. A smooth road is a so-called “empty road”. Focusing on the fact that this smooth road is used as a way out for a congested road, there is not much to display a traffic jam status corresponding to a smooth road away from a congested road. meaningless. Therefore, if the traffic situation is displayed in a display format according to the arrangement relationship with the road exceeding the standard, unlike the uniform display as in the conventional case, effective information can be appropriately displayed, and the traffic situation becomes difficult to recognize. This can be suppressed.

  Specifically, in a display form in which the transparency increases stepwise as the distance from the road that exceeds the standard increases, the traffic congestion status of roads other than the road that exceeds the standard is displayed. Here, the “transparency” is the degree to which the information of a region that overlaps and hides information when the other information is displayed on the displayed information. Thus, by increasing the transparency step by step, it is possible to appropriately display effective information and to suppress the difficulty in recognizing traffic jam information.

The present invention can also be realized as a program invention as described below.
The program of the present invention is based on the map data stored in the map data storage means, the map display control processing for displaying a map, and the traffic jam information acquired by the traffic jam information acquisition means, and the degree of traffic jam is predetermined. Road condition display processing, including road condition determination processing for determining roads exceeding the standard and road condition display control processing for displaying the traffic congestion status of each road based on traffic congestion information on the map displayed in the map display control processing The control process displays the traffic congestion status of roads other than the road exceeding the standard in a display form according to the arrangement relationship with the road exceeding the standard, and the transparency increases step by step as the distance from the road exceeding the standard increases. The display form to be enlarged includes a process of displaying a traffic congestion state of roads other than roads exceeding the reference . By executing such a program in the computer system, the same effect as the above-described navigation apparatus are obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the overall configuration of the in-vehicle navigation device 1 of the present embodiment. The in-vehicle navigation device 1 is configured with a control unit 10 as a center, and a position detector 20, a map data storage unit 30, an operation switch group 40, a communication unit 50, a drawing unit 60, connected to the control unit 10, An audio output unit 70 and an information storage unit 80 are provided. The control unit 10 is configured as a normal computer, and includes a CPU, a ROM, a RAM, an I / O, a bus line for connecting these configurations, and the like. Further, a display 60 a is electrically connected to the drawing unit 60, and a speaker 70 a is electrically connected to the audio output unit 70.

  The position detector 20 has a well-known geomagnetic sensor 21, a gyroscope 22, a distance sensor 23, and a GPS (Global Positioning System) receiver 24 that detects the position of the vehicle based on radio waves from a satellite. . Since these sensors 21 to 24 have errors of different properties, they are used while complementing each other.

The map data storage unit 30 stores so-called map matching data and map data for improving the accuracy of position detection. The map data includes node data and road data (link data). The node data is information on nodes (points) set at intersections and the like, and includes node numbers, node coordinates, road numbers connected to the nodes, and the like. The road data is information on roads connecting the nodes, and is composed of a road number, a node number at the end of the road, a road length, a traveling direction, and the like. In this embodiment, the hard disk device (HDD) is used. Although the HDD is used in the present embodiment, other media such as a DVD-ROM or a memory card may be used.
The operation switch group 40 includes a touch switch integrated with the display 60a, a mechanical switch, a remote control device, or the like, and is used for various inputs.

The communication unit 50 receives information from the information center 90. In the present embodiment, the information center 90 is realized as a VICS (registered trademark, Vehicle Information and Communication System) center. The VICS center multiplexes with the audio broadcast of the FM broadcast station, and transmits VICS information including traffic jam information in the same frequency band.
The VICS information includes VICS node data for specifying a traffic jam section and the like, and VICS road data. These data structures are the same as the node data and road data included in the map data. However, it is conceivable that the node number or road number is different from that of map data, or the details of the data structure are different. In this case, what is necessary is just to convert VICS information according to map data by the vehicle-mounted navigation apparatus 1 side. Of course, the map data on the vehicle-mounted navigation device 1 side may be created according to the VICS information. This is advantageous in that the conversion processing of VICS information becomes unnecessary.

  In the present embodiment, as the traffic jam information, the road number, the head position of the traffic jam section (distance from the road end point), the length of the traffic jam section, and the traffic jam degree are distributed. At this time, since the road can be specified by the road number, the node at the end of the road can be specified. Moreover, it can be determined from the road number connected to the identified node whether the node is an intersection. In addition, when a node is an intersection, it is good also as a data structure in which the information which shows that it is an intersection is contained in node data. In addition, the coordinate value of the head position of the traffic jam section and the coordinate value of the tail of the traffic jam section can be specified from the information on the head position and the length of the traffic jam section on the road. Furthermore, the degree of traffic congestion is indicated in four levels: “traffic jam”, “crowded”, “smooth”, and “unknown”.

As described above, the display 60 a is connected to the drawing unit 60. The display 60a is a color display using liquid crystal or CRT. Information is displayed via the display 60a. In particular, in the present embodiment, the traffic congestion state is displayed over the map display.
A speaker 70a is connected to the audio output unit 70, and guidance by voice is performed through the speaker 70a. The information storage unit 80 is for storing traffic jam information received by the communication unit 50, and is configured by the same HDD as the map data storage unit 30. Of course, other media such as a memory card may be used.

Next, the information reception process will be described based on the flowchart shown in FIG. This information reception process is executed at predetermined time intervals.
In the first step S100 (hereinafter, “step” is omitted and is simply indicated by the symbol “S”), information reception is performed. In this process, the traffic information transmitted from the information center 90 is received by the communication unit 50.

In subsequent S110, it is determined whether or not the received traffic information is traffic jam information. If it is determined that the traffic information is traffic information (S110: YES), the process proceeds to S120. On the other hand, when it is determined that it is not traffic jam information (S110: NO), the process proceeds to S140.
In S120, the road number and the degree of congestion included in the congestion information are acquired. As described above, the traffic information transmitted from the information center 90 includes the road number and the degree of traffic congestion. It has already been described that the degree of traffic jam is indicated in four stages of “traffic jam”, “crowded”, “smooth”, and “unknown”. If the degree of traffic congestion is not information that is indicated stepwise, the information may be converted into stepwise information here.

  In subsequent S130, the road number is stored for each degree of congestion. That is, the road number is stored in the information storage unit 80 in correspondence with “congestion”, “congestion”, and “smooth”. Here, the reception time of the information is also stored. With this configuration, if the information storage unit 80 is searched, “congested road”, “congested road”, and “smooth road” corresponding to “congested”, “congested”, and “smooth” that are the degree of traffic congestion are respectively road numbers. Can be specified. Further, since the reception time is stored, the “congested road” can be specified based on the traffic information received at a past time rather than the traffic information received at a certain time. In addition, after the process of S130 is complete | finished, it transfers to S150.

In S140, which is shifted when it is determined that the traffic information is not traffic jam information, other processing corresponding to the traffic information is executed, and thereafter, the process proceeds to S150.
In S150, it is determined whether there is unprocessed traffic information. Here, when it is determined that there is unprocessed information (S150: YES), that is, while there is information that has not been processed with the received traffic information, the processing from S110 is repeated. On the other hand, if it is determined that there is no unprocessed information (S150: NO), that is, if all the received traffic information has been processed, this information reception process ends.

  Next, a drawing data writing process performed when the traffic jam information is displayed on the display 60a will be described. The drawing data is image data that can be processed as an image. In the present embodiment, it is assumed that drawing data corresponding to all the traffic jam information received by the communication unit 50 is written to a predetermined memory. The predetermined memory is possessed by the control unit 10, and by transferring drawing data in a predetermined section range from the predetermined memory to the drawing unit 60, traffic congestion information around the vehicle is displayed on the display 60a. Here, the congested road process, which is the drawing data writing process for the congested road and the congested road, will be described first, and then the smooth road process, which is the drawing data writing process for the smooth road, will be described.

FIG. 3 is a flowchart showing the congestion road processing.
In the first step S200, road numbers of a congested road and a congested road are acquired. In this process, the information storage unit 80 is searched, and a road number having a congestion degree of “congestion” or “congestion” is acquired.
In subsequent S210, information on traffic jam and congestion is written out. Specifically, drawing data for drawing a red arrow is written in correspondence with a congested road. Also, drawing data for drawing a yellow arrow is written in correspondence with a busy road.

In the next S220, it is determined whether or not all the congested roads and the congested roads have been processed. If it is determined that all processing has been performed (S220: YES), the traffic jam road processing is terminated. On the other hand, as long as there is something that has not been processed (S220: NO), the processing from S200 is repeated.
FIG. 4 is a flowchart showing smooth road processing.

In the first S300, the road number of the smooth road is acquired. In this process, the information storage unit 80 is searched, and a road number whose traffic congestion degree is “smooth” is acquired.
In next step S310, it is determined whether or not the smooth road is a predetermined distance A (for example, 200 m) or more from the current congested road. Therefore, in the present embodiment, a “road with a degree of congestion exceeding a predetermined standard” is defined as a congestion road. The road number of the current congested road can be acquired by searching the information storage unit 80 as described above. In the present embodiment, whether or not the vehicle is separated is determined based on whether or not the road distance is a predetermined distance A or more. The road-to-road distance is a distance of a road connecting a base point on a congested road and a base point on a smooth road. The base point of this distance is a node indicating the end of the congested road on the congested road side. On the smooth road side, the node indicates the end of the smooth road. These nodes are included in the road data as described above. If it is determined that the distance is greater than or equal to the predetermined distance A (S310: YES), the process proceeds to S320. On the other hand, if it is determined that the distance is not equal to or greater than the predetermined distance A (S310: NO), normal writing is performed in S330, and then the process proceeds to S360. The normal writing is writing of drawing data for drawing a blue arrow having transparency “0”.

  In S320, it is determined whether or not a predetermined distance B (for example, 400 m) greater than the predetermined distance A is separated. In this process, it is determined whether or not the smooth road determined to be separated by the predetermined distance A or more is further separated by the predetermined distance B or more. If it is determined that the distance is greater than or equal to the predetermined distance B (S320: YES), for example, when a smooth road is 400 m or more away from a congested road, a blue arrow having a transmittance of 80% is drawn in S340. The drawing data is written, and then the process proceeds to S360. On the other hand, when it is determined that the distance is not equal to or greater than the predetermined distance B (S320: NO), for example, when the smooth road is 200 m or more and less than 400 m from the traffic jam road, a blue arrow with a transmittance of 50% is displayed in S350. Drawing data for drawing is written, and then the process proceeds to S360.

In S360, it is determined whether or not all the smooth roads have been processed. If it is determined that all processing has been performed (S360: YES), the regular road processing is terminated. On the other hand, as long as there is something that has not been processed (S360: NO), the processing from S300 is repeated.
After the congestion road processing and the smooth road processing are completed, the drawing data of the predetermined section range is transferred from the predetermined memory to the drawing unit 60, so that an arrow indicating the traffic congestion state is superimposed on the map on the display 60a. Will be displayed.

FIG. 5A is an explanatory diagram showing a screen display example on the display 60a. In this screen display example, the upper part is “north” and will be described below.
In this screen display example, a north-south road SN and an east-west road EW are displayed. Although arrows are drawn along these roads SN and EW, the arrows shown by thick solid lines are actually arrows corresponding to traffic jam roads displayed in red. In addition, an arrow indicated by a thin solid line is an arrow corresponding to a smooth road that is actually displayed in blue, and similarly, an arrow indicated by a one-dot chain line is actually a smooth road that is displayed in blue with a transmittance of 50%. It is a corresponding arrow, and an arrow shown by a broken line is an arrow corresponding to a smooth road displayed in blue with a transmittance of 80%.

  For convenience of explanation, the points S, D1, C, D2, and B are shown on the road SN. These points S, D1, C, D2, and B are not actually displayed on the map. Here, the points S, C, and B are nodes at the end of the traffic jam road. Point C is also a node at the intersection of road SN and road EW. In this embodiment, the points S, C, and B are the base points on the congested road. Furthermore, the point D1 indicates the head position of the traffic jam section, and the point D2 indicates the end position of the traffic jam section. As described above, the node at the end of the road (including the node at the intersection) can be specified based on the road number acquired as traffic jam information. Further, as described above, the coordinate value of the head position and the tail position of the traffic jam section can also be known from the information on the head position of the traffic jam section and the length of the traffic jam section included in the traffic jam information.

FIG. 5A shows a display based on the VICS information received at 15:05 as indicated by the symbol G. In FIG. 5A, it can be seen from the arrows (one indicated by the symbol J) represented by a thick solid line that traffic congestion has occurred in the lane toward the north of the road SN.
In this embodiment, when writing the drawing data of the smooth road, the road distance from the end portion (points S and B) of the traffic jam road and the intersection (intersection C) included in the traffic jam road is a predetermined distance A (for example, 200 m) or more. Is determined (S310 in FIG. 4). If the distance is less than the predetermined distance A (S310: NO), normal writing is performed (S330). For this reason, as shown in FIG. 5A, for example, an arrow corresponding to a smooth road at a distance smaller than the predetermined distance A from the intersection C is displayed as usual (at a transmittance of 0 percent) as indicated by the symbol T1. Will be. On the other hand, if the distance is greater than or equal to the predetermined distance A (S310: YES), it is next determined whether or not the distance is greater than or equal to the predetermined distance B (B> A, for example, 400 m) (S320). If the distance is less than the predetermined distance B (S320: NO), that is, if there is a smooth road at a distance greater than or equal to the predetermined distance A and less than the predetermined distance B, writing is performed with a transmittance of 50% (S350). On the other hand, when the distance is equal to or greater than the predetermined distance B (S320: YES), that is, when there is a smooth road at a distance equal to or greater than the predetermined distance B, writing is performed at 80% transparency (S360). For this reason, as shown in FIG. 5 (a), for example, an arrow corresponding to a smooth road that is a predetermined distance A or more and less than a predetermined distance B from the intersection C is displayed with a transmittance of 50% as indicated by the symbol T2. Will be. Further, for example, an arrow corresponding to a smooth road that is a distance greater than or equal to a predetermined distance B from the intersection C is displayed with a transmittance of 80% as indicated by the symbol T3.

  In this embodiment, the map data storage unit 30 constitutes “map data storage unit”, the communication unit 50 constitutes “congestion information acquisition unit”, and the control unit 10 “road condition determination unit” and “map display”. "Control means" and "road condition display control means" are configured. Further, S120 and S130 in FIG. 2 constitute “road situation determination processing” as processing as “road situation determination means”, and the smooth road processing shown in FIG. 4 is processed as “road situation display control means”. The “road condition display control process” is configured.

As described above, in the present embodiment, a congestion road that is “a road whose degree of congestion exceeds a predetermined standard” is determined, and the congestion status of a smooth road is displayed in a display form according to the arrangement relationship with the congestion road. To do. Specifically, the traffic situation is displayed as an arrow corresponding to a road, and the arrow corresponding to a smooth road is displayed with a stepwise increase in transparency as the distance from the traffic road increases. The “smooth road” here is a so-called “empty road”, but if we focus on the fact that this smooth road is used as a way out of the congested road, the importance of the smooth road away from the congested road is It will fade. Therefore, if the transparency of such a smooth road is increased, effective information can be appropriately displayed unlike the conventional uniform display, and it can be suppressed that the congestion situation becomes difficult to recognize.
Further, in the present embodiment, the distance from the congested road when determining the transparency of the smooth road is the road distance. Therefore, high permeability is set for a smooth road that cannot be used as a road even when a straight road is close to a congested road, such as a general road that runs parallel to an expressway or a road that is three-dimensionally crossed by an elevated road. Thereby, it is possible to display an appropriate traffic situation.

Hereinafter, in order to facilitate understanding of the technical idea of the present invention, variations of the above embodiment will be introduced.
FIG. 5B shows a display based on the VICS information received at 15:25 as indicated by the symbol G. That is, it is based on the VICS information 20 minutes after 15:05, which is the reception time shown in FIG. At this time, when an arrow corresponding to a congested road as shown by symbol T5 in FIG. 5B is displayed, a smooth road away from the congested road is displayed with a large transparency in the above embodiment. On the other hand, a normal arrow may be displayed for a smooth road soon after the congestion is resolved. For example, an arrow (one of which is indicated by a symbol T4) corresponding to a smooth road where traffic congestion has been eliminated within 30 minutes is displayed. In this way, it is possible to specify a road section soon after the congestion is resolved, and it is possible to display a meaningful traffic jam situation.

  In the above embodiment, the transparency is changed step by step to 50% and 80% as the “display mode according to the arrangement relationship”, but gradation is displayed by continuously setting the transparency. Also good.

Further, the “display mode according to the arrangement relationship” is not limited to the change of the transparency. For example, a thin arrow or a small arrow can be considered. That is, it is sufficient if the traffic map is displayed so that the area of the map that is hidden is reduced.
Furthermore, in the above embodiment, the degree of congestion is shown in four stages of “congestion”, “congestion”, “smooth”, and “unknown”. Is a road that exceeds a predetermined standard. On the other hand, a road with a congestion degree of “congested” may be included in the “road where the congestion degree exceeds a predetermined standard”. The same applies to cases where the degree of traffic congestion is indicated in five or more stages.

  In the above embodiment, the distance from the traffic jam road to the smooth road is based on the end of the traffic jam road (points S and B in FIG. 5A) and the intersection included in the traffic jam road (intersection C). The distance is adopted. In other words, considering that a smooth road is used as a path, it is preferable that the distance is based on an end or an intersection of a congested road from the viewpoint of traveling from a congested road to a smooth road. From the same point of view, for example, the head D1 of the traffic jam or the tail D2 of the traffic jam shown in FIG.

By the way, in the said embodiment, although the path | route distance from a base point is employ | adopted, it is good also as a linear distance. The straight line distance from the base point is shown as a circle centered on the base point. Further, instead of the distance from the base point, a linear distance from the road may be adopted. The straight line distance from the road is indicated as a locus when the center of the circle moves on the road.
Furthermore, when determining the “placement relationship with the road exceeding the standard”, the determination is not limited to the determination based on the distance. For example, the determination may be made based on the number of road data (the number of links) constituting a road between a congested road and a smooth road. In this way, when the arrangement relationship with a congested road is determined by the number of links, the number of links between the expressway and a general road that runs parallel to the expressway, as well as the case of determining by the road distance, The number of links between three-dimensionally intersecting roads generally increases. As a result, it is possible to appropriately determine a smooth road that cannot be used as a way out even if the straight distance to the traffic jam road is short.

  In the above embodiment, the information center 90 is realized as a VICS center. It is known that the VICS center multiplexes traffic information with FM broadcasts and distributes them in units of prefectures. In the above embodiment, all the received traffic jam information is processed (S360 in FIG. 4), and is written in a predetermined memory as drawing data (S330 to S350). On the other hand, you may make it process only the traffic congestion information of the periphery part of the own vehicle. In this case, for example, a range that the host vehicle can reach before receiving the next information is obtained, and traffic jam information about the range is processed. Further, the information center 90 may be realized not as the VICS center itself but as a center separate from the VICS center. Furthermore, the delivery method from the information center 90 is not limited. For example, traffic information may be acquired from the information center 90 using a telephone line.

  In the above-described embodiment, it is assumed that traffic jam information is acquired from the information center 90. However, the map data storage unit 30 may adopt a configuration in which statistical information obtained by statistics of past traffic jam information is stored. Good. In this case, a congested road and a smooth road are determined based on statistical information stored in the map data storage unit 30 instead of the traffic jam information acquired by the communication unit 50. In this way, even if there is no information from the information center 90, a statistical display can be performed.

  As mentioned above, this invention is not limited to the said embodiment at all, In the range which does not deviate from the meaning of invention, it can implement with a various form.

It is a block diagram which shows the structure of the vehicle-mounted navigation apparatus of embodiment of this invention. It is a flowchart which shows the information reception process in embodiment of this invention. It is a flowchart which shows the congestion road process in embodiment of this invention. It is a flowchart which shows the smooth road process in embodiment of this invention. It is explanatory drawing which shows the example of a display screen of the traffic congestion condition in embodiment of this invention.

Explanation of symbols

  1: vehicle-mounted navigation device, 10: control unit (road condition judgment means, road condition display control means, map display control means), 20: position detector, 21: geomagnetic sensor, 22: gyroscope, 23: distance sensor, 24: GPS receiver, 30: Map data storage unit (map data storage unit), 40: Operation switch group, 50: Communication unit (congestion information acquisition unit), 60: Drawing unit, 60a: Display, 70: Audio output unit 70a: speaker, 80: information storage unit (information storage means), 90: information center.

Claims (2)

Map data storage means for storing map data;
Map display control means for displaying a map based on the map data stored in the map data storage means;
Traffic information acquisition means for acquiring road traffic information,
Based on the traffic jam information acquired by the traffic jam information acquisition unit, a road situation determination unit that determines a road having a traffic congestion level exceeding a predetermined standard;
On the map displayed by the map display control means, road condition display control means for displaying the traffic condition of each road based on the traffic information, and
The road condition display control means displays a traffic congestion situation of roads other than the road exceeding the reference in a display form according to the arrangement relationship with the road exceeding the reference, and the distance from the road exceeding the reference increases. in the display mode to increase the transmission rate stepwise, features and be Luna navigation apparatus to display the traffic conditions of the road other than the road over the reference. A map display control process for displaying a map based on the map data stored in the map data storage means;
A road condition determination process for determining a road whose degree of congestion exceeds a predetermined standard based on the congestion information acquired by the congestion information acquisition means;
On the map displayed in the map display control process, including road condition display control process for displaying the traffic condition of each road based on the traffic information,
The road status display control process displays the traffic congestion status of roads other than the road exceeding the standard in a display form according to the arrangement relationship with the road exceeding the standard, and the distance from the road exceeding the standard increases. A program characterized by including a process of displaying a traffic congestion state of roads other than roads exceeding the standard in a display form in which the transparency is increased stepwise .

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