JP2004257852A - Navigation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a navigation system which searches for a safer route for a driver from the point of view of the carelessness of the driver. <P>SOLUTION: The navigation system 1 includes a route search means 20 for searching for a plurality of routes to the destination; a carelessness inducement degree determination means 40 which reads out road information on the plurality of routes found by the route search means 20 from a road information database 10 having the information on roads, and which determines the carelessness inducement degree of each route, for the driver on the route, using the road information; and a recommended route determination means 50 which determines the recommended route to the destination, using the carelessness inducement degree of the route determined by the carelessness inducement degree determination means 40. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a navigation device that searches for a route to a destination and provides a safe traveling route to an occupant.
[0002]
[Prior art]
When setting a route connecting a departure place and a destination by a route search, a conventional navigation device sets a route in consideration of information on past traffic accidents (for example, Patent Document 1). This apparatus performs a route search process based on information on a past traffic accident so as to avoid a road where a traffic accident frequently occurs. Prior art documents related to the present invention include the following.
[Patent Document 1]
JP-A-2002-156239
[0003]
[Problems to be solved by the invention]
In general, traffic accidents occur frequently in many places with heavy traffic. However, a crossing accident, which is a typical intersection accident, occurs more frequently at signalless intersections where traffic is lighter than at signalized intersections where traffic is heavy. This is because the driver tends to be careless and make mistakes at a no-signal intersection where the traffic volume is small. The conventional device as described above has a problem that, instead of avoiding a place where a traffic accident frequently occurs, there is a possibility that the driver may be guided on a route that passes through many places where the driver is careless and is likely to make a mistake.
[0004]
The present invention provides a navigation device that searches for a safer route for a driver in terms of the driver's carelessness.
[0005]
[Means for Solving the Problems]
A navigation device according to the present invention reads out road information on a plurality of routes searched by a route search unit from a route search means for searching for a plurality of routes to a destination and a road information database having information on roads. A safety route inducing degree for the driver of the route using a route, and a recommended route to the destination using the safety level of the route determined by the safety level inducing device. Recommended route determination means to perform the determination.
[0006]
【The invention's effect】
Judgment of the driver's alertness by the route is determined, and the recommended route to the destination is determined using the determined alertness. Route can be selected.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
<< 1st Embodiment >>
A navigation device according to a first embodiment of the present invention will be described with reference to the drawings.
[0008]
FIG. 1 is a block diagram illustrating an outline of the navigation device 1. As shown in FIG. 1, the navigation device 1 includes a road information database 10 having information on roads, a route search unit 20, a safety alert degree determination criterion storage unit 30, a safety alert degree determination unit 40, and a recommended route determination. It comprises means 50 and route guidance means 60.
[0009]
The road information database 10 stores information on an intersection position, information on the presence or absence of a traffic light, information on the presence or absence of a temporary stop regulation, and the like, and forms a database. The road information database 10 is, for example, a memory that stores information. The route searching means 20 detects a current value by a GPS receiver or the like, and searches for a traveling route from the current value to the destination.
[0010]
The road information database 10, the route search means 20, the safety-of-induction-criterion determination criterion storage means 30, the security-of-induction-induction degree determining means 40, and the recommended route determination means 50 can be configured as, for example, one controller. The controller includes a CPU and peripheral components of the CPU such as a ROM and a RAM. The software configuration of the CPU can configure the route searching means 20, the outage trigger determining means 40, and the recommended route determining means 50. The processing in the alertness induction degree determining means 40 and the recommended route determining means 50 will be described later.
[0011]
The route guidance unit 60 includes, for example, a display monitor or an audio output device, and provides the user with the determination result determined by the recommended route determination unit 50 to perform the route guidance.
[0012]
Next, the operation of the navigation device 1 according to the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a flowchart illustrating a processing procedure of the route guidance control processing according to the first embodiment. This process starts when the user performs an input operation to the route search means 20.
[0013]
In step S101, information on the current location and the destination is obtained by an input operation from the user. In step S102, the route search means 20 searches a plurality of routes from the current value to the destination using the map data stored in the memory.
[0014]
In step S103, the alertness induction degree determination means 40 reads the intersection data present in the route from the road information database 10 for each route searched in step S102. Here, as shown in FIGS. 3 (a) to 3 (c), the type of the intersection is set to a no-signal intersection N without a stop regulation, an intersection K with a stop regulation, or a signal at both the approach side and the intersection side. Classify into intersection S. Then, as the intersection data, the number of times of entry into the intersection N without stop regulation, the number of entries into the stop regulation intersection K, and the number of entry into the signalized intersection S are acquired for each route.
[0015]
In step S104, the degree of alertness induction of each route is calculated. Here, let the degree of outage induced by the traveling environment while the driver is traveling on the route to the destination be the outage induction degree Yr of the traveling route. In the first embodiment, the degree of out-of-service caused by an intersection in the route is determined. Hereinafter, a method of calculating the degree of safety interruption of each route will be described with reference to FIGS. 4 and 5.
[0016]
FIG. 4 shows criteria for judging the degree of alertness induction according to the type of intersection. As shown in FIG. 4, the alertness induction degree Yc according to the intersection type includes the alertness induction degree Yc = 1 at the signalized intersection S, the alertness induction degree Yc at the stop regulation intersection K = 30, and the alertness at the intersection N without stop regulation. The degree of induction Yc is set to 100. The alertness induction degree Yc corresponding to the intersection type shown in FIG. 4 indicates a larger value as the degree of the driver's alertness induction at the time of approaching the intersection is higher, and is appropriately set in advance and is set in advance as an alertness induction degree determination reference storage means. 30 is stored. For all the intersections in the route, the degree Yc of safety interruption is determined according to the criterion in FIG.
[0017]
Next, from the number of times of passage for each intersection type of each route acquired in step S103 and the degree of safety interruption Yc for each intersection type, the degree of safety interruption Yr of each route is calculated by (Equation 1).
(Equation 1)
Yr = (Ni · 100 + Ki · 30 + Si) / (Ni + Ki + Si) (Equation 1)
Here, Ni: the number of times of entry into the unrestricted intersection N in the route i, Ki: the number of times of entry into the stop regulation intersection in the route i, and Si: the number of entry into the signalized intersection S in the route i. Note that the greater the degree Yr of the safety alert, the greater the degree to which the driving environment in the route induces the safety of the driver, indicating that the driver is more likely to make a mistake and encounter an unexpected situation. .
[0018]
FIG. 5 shows the number of passes for each type of intersection and the calculation results of the degree of safety alert Yr according to (Equation 1) for the routes 1 to 5 searched for in step S102. As shown in FIG. 5, among the routes 1 to 5, the route with the highest alertness Yr is 1, and the route with the lowest alertness Yr is 5.
[0019]
In step S105, the recommended route determination unit 50 determines a recommended route based on the safety-inducing degree Yr of each route calculated in step S104. For example, among the searched routes 1 to 5, the route 5 with the lowest alertness Yr is selected as the recommended route. In step S106, the route guidance unit 60 transmits the route selected in step S105 to the user via a display monitor or the like, and starts route guidance to the user.
[0020]
As described above, in the first embodiment, the degree of alertness induction Yc is set according to the type of intersection, and the criteria for determining the degree of alertness induction Yc as shown in FIG. 4 are set. Hereinafter, the setting of the degree of alertness induction Yc according to the intersection type will be briefly described.
[0021]
After conducting a detailed study of the occurrence of encounter accidents at intersections, the probability of occurrence of encounter accidents was found to increase in the order of signalized intersection S, stop-restricted intersection K, and non-signalized intersection N with no stop-restriction. I understood. At signalized intersections where there is a lot of traffic, it is very likely that the driver will encounter an intersecting vehicle when making a mistake, but the traffic is regulated by traffic signals and the driver is less likely to make a mistake. .
[0022]
On the other hand, at a stop regulation intersection without a traffic light, the regulation power of traffic regulation is weaker than at a traffic intersection. In addition, stop-regulated intersections generally have less traffic than signalized intersections, and even if a driver makes a mistake, they do not always encounter an intersecting vehicle, so drivers tend to make mistakes more easily than signalized intersections. is there. In addition, at intersections where there are no traffic lights and no stoppage regulation, the regulation power of traffic regulation is even weaker than that of other types of intersections, and the traffic volume is smaller. As a result, the driver is less likely to encounter an intersecting vehicle, and the driver tends to make mistakes more easily than at other intersections.
[0023]
In other words, the type of the intersection, that is, the characteristics of the intersection, makes it easy for the driver to be careful when entering the intersection (the probability of making a mistake). Therefore, as shown in FIG. 4, the degree of safety-causing induction Yc according to the traveling environment is set according to the type of intersection.
[0024]
Thus, in the first embodiment described above, the following operational effects can be obtained.
(1) For a plurality of routes searched by the route search means 20, the driving environment in the route determines the degree Yr of inducing the driver to be alert, and the determined degree of inducing Yr to the destination is used by using the determined degree of inducing Yr. The recommended route was determined. Thus, an optimal route to the destination can be selected from the viewpoint of the driver's carelessness due to the traveling environment.
(2) Based on intersection information on the route, such as information on the intersection position, information on the presence or absence of a traffic light, and information on the presence or absence of temporary stop regulation, and a predetermined criteria for determining the degree of safety outage, the degree of safety outage for each route. Yr is determined. This makes it possible to select an optimal route in consideration of the degree of alertness induction at the intersection, that is, the ease with which the driver is alert.
(3) The criteria for determining the degree of alertness induction are set according to the type of intersection, and as shown in FIG. 4, an intersection S with a traffic light, a no-signal intersection K with a stop regulation, and a no-signal intersection N without a stop regulation, as shown in FIG. Are set in such a manner that the outage trigger Yc increases. By setting criteria for determining the degree of safety alert in accordance with the type of intersection that greatly affects the number of encounter accidents, it is possible to select the optimal route in consideration of the type of intersection that actually causes the driver to be alert. it can. That is, since a traveling route that is unlikely to encounter a situation that may cause the driver to be careless regarding the encounter accident is selected, a safer route can be selected.
(4) Since the route guidance is performed by the route guidance unit 60 according to the recommended route based on the degree of alertness Yr determined by the recommended route determination unit 50, it is possible to provide a safer route and perform the route guidance.
[0025]
In the first embodiment described above, the degree of safety interruption Yr of each route is calculated using (Equation 1), but the method of calculating the degree of safety interruption Yr is not limited to this. For example, the following formula (2) can be used to calculate the cumulative degree of interruption Yra on the route i.
(Equation 2)
Yra = (Ni · 100 + Ki · 30 + Si) (Equation 2)
[0026]
By providing the cumulative degree of safety interruption Yra of each route calculated using (Equation 2) as advance information before starting the route guidance, it is possible to alert the user and perform effective route guidance. .
[0027]
<< 2nd Embodiment >>
Hereinafter, a navigation device 2 according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a block diagram illustrating an outline of the navigation device 2. 6, components having the same functions as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals. Here, differences from the first embodiment will be mainly described.
[0028]
As shown in FIG. 6, the navigation device 2 includes a route information transmitting unit 70 that transmits route information on a traveling route to the destination searched for by the route searching unit 20 to a user, and a driver for selecting a traveling route. A selection switch 80 is further provided. The route information transmitting means 70 displays the route information on a display monitor and transmits the information to the driver.
[0029]
Next, the operation of the navigation device 2 according to the second embodiment will be described with reference to FIG. FIG. 7 is a flowchart illustrating a processing procedure of the route guidance control processing according to the second embodiment. This process starts when the user performs an input operation to the route search means 20.
[0030]
The processing in steps S201 to S205 is the same as the processing in steps S101 to S105 in the flowchart of FIG. In step S205, the recommended route determination unit 50 determines a recommended route based on the safety-inducing degree Yr of each route, and then proceeds to step S206.
[0031]
In step S206, the route information transmitting unit 70 transmits the information on the safety-causing induction degree Yr of each route calculated in step S204 and the recommended route determined in step S205 to the driver. Here, the route information transmitting means 70 includes information on not only the route having the lowest alertness Yr determined as the recommended route by the recommended route determining means 50 but also a recommended route in which the alertness trigger Yr is associated with each route. To the user. For example, it is possible to transmit a recommended level for each route based on the alertness induction degree Yr.
[0032]
In step S207, the user operates the selection switch 80 to select a route to the destination based on the transmitted information. In step S208, the route guidance unit 60 transmits the route selected in step S207 via the selection switch 80 to the user via a display monitor or the like, and starts route guidance to the user.
[0033]
As described above, in the second embodiment described above, in addition to the effects of the first embodiment, the following operation and effect can be obtained.
(1) The route information transmitting unit 70 transmits to the user information on the degree Yr of injuries of each route determined by the alertness determining unit 40 and the recommended route determined by the recommended route determining unit 50. Thereby, the user can be made to grasp the level of the alertness induction Yr regarding the route before traveling, and can call attention.
(2) According to the route information transmitted by the route information transmitting means 70, the user can select a route by using the selection switch 80 from a plurality of routes. The route guidance unit 60 performs route guidance according to the route selected by the selection switch 80, so that route guidance suitable for the user can be performed.
[0034]
<< Third Embodiment >>
Hereinafter, a navigation device 3 according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a block diagram illustrating an outline of the navigation device 3. In FIG. 8, components having the same functions as those in the second embodiment shown in FIG. 6 are denoted by the same reference numerals. Here, differences from the second embodiment will be mainly described.
[0035]
As shown in FIG. 8, the navigation device 3 further includes a driving consciousness determination unit 200 that determines a driver's consciousness for safe driving. That is, the navigation device 3 according to the third embodiment determines the recommended route to the destination in consideration of the driver's awareness of safe driving. The driving consciousness determining unit 200 includes driving state detecting means 90 for detecting a vehicle signal for evaluating the driving state, driving consciousness storing means 100, driving consciousness determining means 110, and driving consciousness criterion storing means 120.
[0036]
The driving consciousness storage unit 100, the driving consciousness determining unit 110, and the driving consciousness criterion storage unit 120 can be configured as, for example, one controller. The controller includes a CPU and CPU peripheral components such as a ROM and a RAM, and the driving consciousness determination unit 110 can be configured by the software form of the CPU. The driving state detecting means 90 is a vehicle speed sensor that detects the own vehicle speed as a vehicle signal, for example.
[0037]
Hereinafter, the determination of the safe driving consciousness of the driver performed by the driving consciousness determination unit 200 will be described. In the third embodiment, the driving consciousness determining means 110 determines the driving consciousness when the driver enters the intersection by using the vehicle speed at the time of entering the intersection and the vehicle speeds before and after the approaching detected by the driving state detecting means 90. I do. Specifically, the driving state is evaluated based on the vehicle speed signal at the time of entering the intersection, and the safe driving consciousness is determined based on the evaluation result. Hereinafter, a method of evaluating a driving state based on a vehicle speed signal when approaching an intersection will be described with reference to FIGS.
[0038]
FIGS. 9A to 9C show examples of changes in the vehicle position and the vehicle speed when entering an intersection with a stop restriction. The horizontal axis in FIGS. 9A to 9C indicates the vehicle position with respect to the intersection. The intersection approach position where the own vehicle road and the intersection road intersect is defined as 0 (m), and the stop line position is defined as −. 2 (m).
[0039]
In the intersection approach (Type A) as shown in FIG. 9A, the vehicle sufficiently decelerates near the stop line (vehicle position = −2), slowly drives down to the intersection approach position (vehicle position = 0), Therefore, they stop once and then start. When such a driving is being performed, the safety check is often performed surely, and a slow approach at the intersection can inform the intersection vehicle of the existence of the own vehicle. In other words, it can be said that an operation state like Type A is an operation with a very high safety awareness, and the evaluation value of the operation state is determined to be the highest level of 10 points.
[0040]
In an intersection approach (type B) as shown in FIG. 9B, the vehicle speed is reduced as approaching the intersection approach position, and the vehicle speed is reduced to about 5 km / h or less when approaching the intersection. In this case, although it is not as cautious as approaching the type A intersection, the safety has been checked to some extent, and it can be said that the possibility of encountering an accident in the intersection is low. Therefore, the evaluation value of the operating state such as type B is determined to be two points.
[0041]
In the type C intersection approach shown in FIG. 9 (c), the vehicle enters the intersection without slowing down and with insufficient deceleration, and the type D intersection approach enters the intersection at almost constant speed without deceleration. I have. Type D is a driving that is most likely to encounter an accident in an intersection, and type C is likely to encounter an accident next to type D. Therefore, the evaluation value of the operating state such as Type C is determined to be -5 points, and the evaluation value of the operating state such as Type D is determined to be -10 points.
[0042]
As described above, the state of the driver at the time of entering the intersection is classified based on the vehicle speed signal, and the driving state is evaluated. The criteria for the evaluation value of the driving state are appropriately set in advance and stored in the driving consciousness criteria storage means 120.
[0043]
The driving consciousness determining means 110 stores the evaluation value determined based on the vehicle speed at the time of entering the intersection and before and after the intersection as the level of the driver's consciousness for safe driving, that is, the safe driving consciousness evaluation value Pn, in the driving consciousness storing means 100. . The safe driving consciousness evaluation value Pn stored in the driving consciousness storage means 100 is used when the recommended route determination means 50 determines a recommended route to a destination.
[0044]
As the safe driving consciousness evaluation value Pn, for example, an evaluation value of a driving state at the time of entering an intersection is accumulated for a predetermined period, and an average value thereof can be used. Similarly, when entering an intersection where there is no stop regulation, the evaluation value of the driving state can be determined from the relationship between the vehicle position and the vehicle speed change with respect to the intersection, and the safe driving awareness evaluation value Pn can be determined.
[0045]
Next, the operation of the navigation device 3 according to the third embodiment will be described with reference to FIG. FIG. 10 is a flowchart illustrating a processing procedure of the route guidance control processing according to the third embodiment. This process is started when a user inputs a current value and a destination to the route search means 20.
[0046]
The processing in steps S301 to S304 is the same as the processing in steps S201 to S204 in the flowchart of FIG. After calculating the alertness induction Yr of each route in step S304, the process proceeds to step S305.
[0047]
In step S305, the recommended route determination unit 50 reads the data of the driver's safe driving consciousness evaluation value Pn determined by the driving consciousness determination unit 110 as described above and stored in the driving consciousness storage unit 100. In step S306, the recommended route is determined as described below based on the safety-caused induction degree Yr of each route calculated in step S304 and the driver's safe driving evaluation value Pn acquired in step S305.
[0048]
Specifically, the recommended route determination unit 50 compares the calculated degree of safety alert Yr of each traveling route with an allowable level of the degree of safety alert Yr according to the safe driving consciousness evaluation value Pn, and recommends the destination to the destination. Determine the route. FIG. 11 shows an allowable level of the degree of safety Yr of the traveling route with respect to the safe driving awareness evaluation value Pn. As shown in FIG. 11, as the safe driving consciousness evaluation value Pn increases, the allowable level of the safety-inducing degree Yr increases. This tolerance level is appropriately set in advance and stored in the memory of the controller. The recommended route determination unit 50 can determine, for example, a route in which the degree of safety alert Yr on the route does not exceed an allowable level as a recommended route.
[0049]
In step S307, the route information transmitting unit 70 transmits to the user the information on the safety-causing induction degree Yr of each route calculated in step S304 and the recommended route based on the awareness of safe driving determined in step S306. For example, the degree of alertness induction Yr is transmitted for the route determined as the recommended route in step S306. The route information transmitting unit 70 transmits to the user not only the route determined as the recommended route by the recommended route determining unit 50 but also the recommended route information in which each of the routes is associated with the degree Yr of injuries to the allowable level. You can also.
[0050]
In step S308, the user operates the selection switch 80 to select a route to the destination based on the transmitted information. In step S309, the route guidance unit 60 transmits the route selected in step S308 via the selection switch 80 to the user via a display monitor or the like, and starts route guidance to the user.
[0051]
Thus, in the third embodiment described above, the following operational effects can be obtained.
(1) The driving consciousness determining means 110 determines the driver's consciousness for safe driving using the vehicle signal detected by the driving state detecting means 90. The recommended route determination means 50 determines a recommended route to the destination based on the safety alert degree Yr of each route, the driving consciousness of the driver, and the allowable level of the safety alertness for the driving consciousness. The permissible level of the degree of alertness to driving consciousness is appropriately set in advance as shown in FIG. Accordingly, the recommended route determination unit 50 can determine the recommended route within the range of the degree of safety-caused induction Yr that is allowed according to the driver's driving consciousness level objectively determined.
(2) The route information transmitting means 70 transmits information on the degree of safety Yr of each route determined by the safety factor determining means 40 and the recommended route based on the driving consciousness of the driver determined by the recommended route determining means 50 to the user. To communicate. Thereby, the user can be made to grasp the level of the alertness induction degree Yr according to the driving consciousness regarding the route before traveling, and can be alerted.
(3) In accordance with the route information transmitted by the route information transmitting means 70, the user can select a route by using the selection switch 80 from a plurality of routes. The route guidance unit 60 performs route guidance according to the route selected by the selection switch 80, so that route guidance suitable for the user can be performed.
(4) The driving state detecting means 90 detects the vehicle speed at the time of entering the intersection and the vehicle speed before and after the vehicle as a vehicle signal. Determine driving consciousness. As shown in FIG. 11, the permissible level of the degree Yr of injuries to the driving consciousness is set to increase as the evaluation value Pn of the driving consciousness increases. This makes it possible to determine a recommended route that matches the driver's awareness of safe driving.
[0052]
In the above-described third embodiment, the route information transmitting unit 70 provides the user with the degree of safety Yr of each route and a recommended route based on driving consciousness to the user. You can now select a travel route. However, the present invention is not limited to this, and the route guidance unit 60 can perform route guidance according to the recommended route determined by the recommended route determination unit 50. In this case, the path information transmitting means 70 and the selection switch 80 can be omitted. The recommended route determination unit 50 calculates, for each route, the ratio of the degree of alertness Yr to the allowable level shown in FIG. 11 and determines the route having the smallest ratio of the degree of alertness Yr to the allowable level as the recommended route. be able to.
[0053]
In the first to third embodiments, the road information database is configured as a memory in the controller. However, the present invention is not limited to this. For example, a storage medium storing road information may be used. In this case, the navigation device includes a reading unit that reads information stored in the storage medium. In addition, the latest road information stored in an external base station or the like can be obtained via communication means such as a mobile phone.
[0054]
The criterion for determining the degree of alertness Yc according to the type of intersection shown in FIG. 4 is not limited to the above-described embodiment, and may be any value as long as the degree Yc of alertness due to intersection can be appropriately represented according to the type of intersection. Also, the values of the evaluation values of the driving state at the time of entering the intersection shown in FIGS. 9A to 9C are not limited to the above-described embodiment, and may be any values as long as the driving state can be objectively evaluated. Also, the type at the time of entering the intersection is not limited to A to D.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a navigation device according to a first embodiment of the present invention.
FIG. 2 is a flowchart illustrating a procedure of a route guidance control process according to the first embodiment;
3A is a diagram showing a no-signal intersection without stop regulation, FIG. 3B is a diagram showing an intersection with stop regulation, and FIG. 3C is a diagram showing an intersection with a traffic light.
FIG. 4 is a diagram showing criteria for judging the degree of alertness induction according to an intersection type.
FIG. 5 is a diagram showing the number of times of entry for each type of intersection in each route and the result of calculating the degree of safety trigger.
FIG. 6 is a diagram showing a configuration of a navigation device according to a second embodiment.
FIG. 7 is a flowchart illustrating a procedure of a route guidance control process according to the second embodiment;
FIG. 8 is a diagram showing a configuration of a navigation device according to a third embodiment.
9A is a diagram showing a change in vehicle speed when entering a type A intersection, FIG. 9B is a diagram showing a change in vehicle speed when entering a type B intersection, and FIG. 9C is a diagram showing a change in vehicle speed when entering a type C intersection. The figure which shows the vehicle speed change situation.
FIG. 10 is a flowchart illustrating a processing procedure of route guidance control processing according to the third embodiment.
FIG. 11 is a diagram showing an allowable level of a degree of safety alertness with respect to a safe driving consciousness evaluation value.
[Explanation of symbols]
10: Road information database
20: Route search means
30: Means of storing the degree of alertness induction degree determination
40: Means of judging the degree of carelessness induction
50: Recommended route determination means
60: route guidance means
70: Route information transmission means
80: Selection switch
90: Operating state detecting means
100: driving consciousness storage means
110: driving consciousness determination means
120: driving consciousness determination standard storage means

Claims (11)

Route search means for searching for a plurality of routes to the destination;
The road information on the plurality of routes searched by the route searching means is read from a road information database having information on roads, and the road safety information is determined for each route using the road information. Means for judging the degree of alertness induction,
A navigation device, comprising: a recommended route determining unit that determines a recommended route to the destination by using the alertness trigger of the route determined by the alertness determining unit. The navigation device according to claim 1,
The road information stored in the road information database is information on the position of the intersection, information on the presence or absence of a traffic light, and information on the presence or absence of a stop regulation,
The navigation apparatus according to claim 1, wherein the safety alert degree determining means determines the safety alert degree of the route based on the road information and a preset determination criteria of the safety alert degree. The navigation device according to claim 2,
The criterion of the alertness induction degree is set according to the type of intersection, the intersection of a traffic light, a no-signal intersection with a stop regulation, and a no-signal intersection without a stop regulation, the higher the alertness induction degree in the order A navigation device characterized in that the navigation device is set to be: The navigation device according to any one of claims 1 to 3,
A navigation device, further comprising a route guidance unit that performs route guidance according to the recommended route determined by the recommended route determination unit. The navigation device according to any one of claims 1 to 3,
A navigation device, further comprising an information transmitting unit that transmits to the user the alertness induction degree for each route determined by the alertness induction degree determination unit and the recommended route determined by the recommended route determination unit. . The navigation device according to claim 5,
Selection means for allowing the user to select a traveling route from the plurality of routes to the destination according to the information transmitted by the information transmission means,
A navigation device, further comprising: route guidance means for performing route guidance according to the travel route selected and instructed by the selection means. The navigation device according to claim 1,
Driving state detection means for detecting a driving state of the vehicle;
A driving consciousness determining unit that determines a driver's consciousness for safe driving using the driving state detected by the driving state detecting unit,
Further comprising a driving consciousness storage means for storing the driving consciousness determined by the driving consciousness determination means,
The recommended route determination means, based on the safety alert induction degree of the route, the driving awareness stored in the driving awareness storage means, and a predetermined allowable level of the safety alert triggering degree for the driving awareness, A navigation device for determining a recommended route. The navigation device according to claim 7,
A navigation device, further comprising: route guidance means for performing route guidance according to the recommended route determined by the recommended route determination means. The navigation device according to claim 7,
The information transmission means for transmitting to the user the safety-cause induction degree for each route determined by the safety-cause induction degree determination means and the recommended route based on the driving consciousness determined by the recommended route determination means. A featured navigation device. The navigation device according to claim 9,
Selection means for allowing the user to select a traveling route from the plurality of routes to the destination according to the information transmitted by the information transmission means,
A navigation device, further comprising: route guidance means for performing route guidance according to the travel route selected and instructed by the selection means. The navigation device according to any one of claims 7 to 10,
The driving state detection means detects, as the driving state of the vehicle, a vehicle speed when entering an intersection,
The driving consciousness determining means determines the driving consciousness of the driver at the time of approaching the intersection using the vehicle speed detected by the driving state detecting means,
The navigation device according to claim 1, wherein the allowable level of the degree of safety offense is set to increase as the evaluation of the driving consciousness increases.

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