JP7417372B2 - Route guidance system, route guidance device, route guidance method and program - Google Patents

Description

The present invention relates to a route guidance system, a route guidance device, a route guidance method, and a program.

BACKGROUND ART There is a known technique for searching for routes from a departure point to a destination, evaluating these searched routes based on predetermined criteria, and presenting each route to a user in order of the evaluation results. For example, we evaluate the arrival time to the destination of each route, the fare incurred when heading to the destination on each route, the amount of gasoline consumed when heading to the destination on each route, etc., and the evaluation results are ranked in order of best. A technique is known in which routes are presented to the user in order of arrival time, cheapest fare, least gasoline consumption, etc.

Furthermore, techniques for evaluating the ease of driving a vehicle on a road or a certain unit area are also known (see, for example, Patent Documents 1 and 2).

JP2016-194867A Japanese Patent Application Publication No. 2010-2364

However, conventionally, there has been no technology for evaluating routes from the viewpoint of whether the route is easy for a user to drive (for example, a route with few left or right turns, a route with relatively wide road width, a route with few accidents, etc.). For this reason, it was unclear whether the route searched for by the route search was a route that was easy for the user to drive.

The embodiments of the present invention have been made in view of the above points, and an object thereof is to evaluate the ease of driving for a user with respect to each searched route.

In order to achieve the above object, the route guidance system according to the present embodiment searches for one or more routes from the departure point to the destination based on search conditions that include at least a departure point and a destination. and calculating means for calculating, for each of the one or more routes searched by the searching means, an index value representing the ease of driving the vehicle when the route is driven by a vehicle; The method further comprises a display means for displaying each of the one or more routes searched by the search means and an index value calculated by the calculation means for each of the one or more routes in association with each other. Features.

It is possible to evaluate the ease of driving for the user with respect to each searched route.

It is a figure which shows an example of a route guidance screen. FIG. 1 is a diagram showing an example of a functional configuration of a route guidance device according to the present embodiment. It is a figure showing an example of accident information. FIG. 6 is a diagram illustrating an example of a direction definition in angle determination. 3 is a flowchart illustrating an example of route guidance processing according to the present embodiment. 1 is a diagram showing an example of the hardware configuration of a route guidance device according to the present embodiment.

Hereinafter, an embodiment of the present invention (hereinafter also referred to as "this embodiment") will be described. In this embodiment, a route guidance device 10 that can evaluate the ease of driving when a user drives a vehicle on each route searched by route search will be described. Here, in this embodiment, a "degree of kindness" is introduced as an evaluation index for evaluating the ease of driving a route. The higher the value of friendliness, the easier it is to drive, and as described later, for example, the friendliness is higher if there are fewer turns, etc. on the route, and the friendliness is higher if the roads are wider on the route. The lower the number of serious accidents that have occurred in the past, the higher the rate will be.

<Route guidance screen>
Each route searched by the route search and the degree of friendliness of each route are displayed on the route guidance screen and presented to the user of the route guidance device 10. This allows the user to know each route and the ease of driving (that is, the ease of driving) of each route.

Here, an example of a route guidance screen displayed by the route guidance device 10 according to the present embodiment will be described with reference to FIG. 1. FIG. 1 is a diagram showing an example of a route guidance screen. In FIG. 1, as an example, a case will be described in which two routes from a departure point S to a destination G are searched by route search. Note that in the example shown in FIG. 1, the map is omitted for simplicity, but the routes R1 and R2 are displayed on the map.

The route guidance screen 1000 shown in FIG. 1 includes routes R1 and R2 from the departure point S to the destination G, and a kindness level display column 1100 in which the kindness levels of these routes R1 and R2 are displayed, respectively. It will be done. In the example shown in FIG. 1, the kindness level of route R1 is "50 points" and the kindness level of route R2 is "80 points" are displayed in the kindness level display field 1100. This allows the user to know that route R2 is easier to drive than route R1. Therefore, for example, by selecting route R2 and pressing a "departure" button or the like, the user can start route guidance along route R2, which is an easy-to-drive route.

Further, on the route guidance screen 1000 shown in FIG. 1, icons C1 to C5 indicating frequent accident points (or points where serious accidents have occurred) on the routes R1 and R2 are displayed. Thereby, the user can know the points where accidents frequently occur (or the points where serious accidents have occurred) on the routes R1 and R2. In the example shown in FIG. 1, icon C1, icon C2, icon C4, and icon C5 respectively indicate the accident-prone points (or points where serious accidents have occurred) on route R1, and icon C2, icon C3, and indicate points where many accidents occur (or points where serious accidents have occurred) on route R2. However, icons indicating these accident-prone locations (or locations where serious accidents have occurred) do not necessarily have to be displayed, and may be able to be switched between display and non-display through user operations or settings, for example. good.

Note that on the route guidance screen 1000 shown in FIG. 1, two routes R1 and R2 and the respective friendliness levels of these routes R1 and R2 are displayed. A route and the degree of kindness of this route may be displayed, or three or more routes and the degree of kindness of each of these routes may be displayed.

<Functional configuration>
Next, the functional configuration of the route guidance device 10 according to this embodiment will be described with reference to FIG. 2. FIG. 2 is a diagram showing an example of the functional configuration of the route guidance device 10 according to the present embodiment.

As shown in FIG. 2, the route guidance device 10 according to this embodiment includes a route guidance processing section 110 and a storage section 120. The route guidance processing unit 110 is realized, for example, by processing that one or more programs installed in the route guidance device 10 causes a processor to execute. Further, the storage unit 120 can be realized using various storage devices such as an auxiliary storage device, for example.

The route guidance processing unit 110 performs a route search, calculates the degree of kindness of the route searched by the route search, and displays a route guidance screen that includes the route searched by the route search and the degree of kindness of the route. (route guidance processing).

The storage unit 120 stores various data used for route search, calculation of kindness level, display of route guidance screen, etc.

For example, the storage unit 120 stores map data as data used to display a route guidance screen. Map data is data for displaying a map, and is created by overlapping layers containing various display data. For example, map data consists of a layer containing display data representing sections of prefectures, etc., and layers containing display data for green areas, rivers, roads, railways, symbols, annotations, etc. to form a single background. , and is further created by overlaying a layer containing display data such as stores and house-shaped frames. Note that the house-shaped frame is display data representing the shape of a building such as a general residence or a commercial facility.

Further, for example, the storage unit 120 stores network data as data used for route searching. Network data is data representing a road network. Network data includes, for example, data related to nodes indicating various points such as intersections, branch points, places where road attributes change, places where road width changes, etc. (hereinafter also referred to as "node data"), and information about nodes between nodes. Data related to connecting links (hereinafter also referred to as "link data") are included. The node data includes, for example, the node number, latitude and longitude, the name of the intersection (kanji and its pronunciation), the presence or absence of a traffic light, and the like. Further, the node data of a node representing an intersection includes a cost used for route search (this cost is also referred to as an "intersection cost"). On the other hand, link data includes, for example, link length, coordinate point sequence, cost used for route search (this cost is also referred to as "link cost"), node numbers of nodes at both ends of the link, road type (national highway, , general road, expressway, narrow street, etc.), road width, search target flag indicating whether it is a link (road) used for route search, traveling direction, altitude, etc. Note that the network data is associated with the map data at the same latitude and longitude.

For example, the storage unit 120 may also contain information (hereinafter also referred to as "accident information") indicating various tables and accident-prone locations (or locations where serious accidents have occurred) as data used to calculate the degree of route friendliness. ) etc. are stored. Details of these tables will be described later. In addition, accident information will be described later, but the accident information includes the date and time of the accident, the place where the accident occurred (occurrence location), the frequency of accidents, the severity of the accidents that occurred, and the type of accident that occurred. (Accident type) etc.

Here, the route guidance processing section 110 includes a condition setting section 111, a route searching section 112, a calculation section 113, and a display control section 114.

The condition setting unit 111 sets conditions for route searching (these conditions are also referred to as "search conditions"). The search conditions include at least a starting point and a destination. In addition to these, the search conditions may include, for example, departure date and time, transit points, weather, and whether a toll road is used. All or part of such search conditions may be input by the user, or may be set in advance, for example. Furthermore, when the current location is used as the starting point, location information (location information indicating the current location) measured by a positioning device such as a GPS (Global Positioning System) receiver may be used.

The route search unit 112 searches for a route from the departure point to the destination based on the search conditions set by the condition setting unit 111. At this time, the route search unit 112 uses a known algorithm such as Dijkstra's method to search for a route that minimizes the cost from the departure point to the destination (for example, the sum of link cost and intersection cost is the minimum). Note that the route search unit 112 may search for only one route, or may search for multiple routes by changing some of the search conditions (for example, waypoints, etc.) Search for multiple routes by changing costs (for example, route search using both link cost and intersection cost, route search using link cost and intersection cost, and also accident cost, which will be described later). Good too.

The calculation unit 113 calculates the degree of kindness of the route searched by the route search unit 112. Details of the method for calculating the kindness level will be described later.

The display control unit 114 uses the route information indicating the route searched by the route search unit 112 and the kindness level calculated by the calculation unit 113 to generate route guidance that includes the route and the kindness level of the route. Display the screen.

Note that as the route guidance device 10 according to the present embodiment, for example, an on-vehicle device, a PC (personal computer), a smartphone, a tablet terminal, a wearable device, a game device, etc. can be used.

Moreover, the functional configuration of the route guidance device 10 shown in FIG. 2 is an example, and other functional configurations may be used. For example, some functions of the route guidance device 10 (for example, at least one of the route search unit 112 and the calculation unit 113) may be provided by a server connected to the route guidance device 10 via a communication network. In other words, the route guidance device 10 and the server may constitute a route guidance system.) In this case, among the data stored in the storage unit 120, data necessary for realizing the part of the function is held by the server.

<How to calculate kindness level>
Here, the method by which the calculation unit 113 calculates the degree of kindness will be explained. In this embodiment, the kindness level is assumed to be a perfect score of 100, and the kindness level is calculated by subtracting points from a predetermined score for each category.

Table 1 below shows an example of the categories and their scoring for calculating the kindness level. Note that a table corresponding to this Table 1 is stored in the storage unit 120, for example.

ここで、カテゴリＹ１「ルート探索基準点」は優しさ度の最低点を設定するためのカテゴリであり、このカテゴリの配点は減点対象とならない。一方で、カテゴリＹ２～カテゴリＹ４の配点は減点対象となる。ただし、各カテゴリの点数がマイナスとなることを防止するため、減点の結果、点数がマイナスとなる場合は当該カテゴリの点数は０とする。

Here, the category Y1 "route search reference point" is a category for setting the lowest point of kindness, and the points assigned to this category are not subject to point deduction. On the other hand, the points assigned to categories Y2 to Y4 are subject to point deduction. However, in order to prevent the score for each category from becoming negative, if the score becomes negative as a result of point deduction, the score for that category will be set to 0.

As described above, if the scores for categories Y1 to Y4 are a ₁ to a ₄ , respectively, then the kindness level is calculated as a ₁ +a ₂ +a ₃ +a ₄ . Note that the categories and their scores shown in Table 1 above are just examples; for example, the scores for each category may be changed as appropriate by the user or the like, or category Y1 may not be provided.

Here, _a1 is the score of category Y1 (that is, "10" in this embodiment). On the other hand, _a2 is the value obtained by subtracting the total number of demerit points from the score allocation for category Y2 and rounding up the decimal point, or 0, whichever is greater, that is, MAX(0, ROUNDUP(score allocation for category Y2 - The total number of demerit points)). Similarly, a ₃ is MAX (0, ROUNDUP (point allocation for category Y3 - total number of deductions in category Y3)), and a ₄ is MAX (0, ROUNDUP (score allocation for category Y4 - number of deduction points in category Y4)). )). Note that MAX is a function that returns the maximum value of the numerical values specified as arguments, and ROUNDUP is a function that returns a numerical value obtained by rounding up the decimal point of the numerical values specified as arguments.

For example, if the total number of demerit points for category Y3 is 1.5, a ₃ =MAX(0,ROUNDUP(40-1.5))=39. The same applies to categories Y2 and Y4.

Hereinafter, a method for calculating the total number of demerit points for categories Y2 to Y3 will be explained.

- Calculation method of total demerit points for category Y2 "accident-prone spot determination" The calculation unit 102 refers to the accident information stored in the storage unit 120 and calculates the route searched by the route search unit 112 (or its surroundings). ) to calculate the number of demerit points according to accidents that have occurred in the past. Here, an example of accident information is shown in FIG. As shown in FIG. 3, the accident information includes the date when the accident occurred, the time period when the accident occurred, the place where the accident occurred, the frequency of occurrence of the accident, the severity of the accident, the accident type, and the like. Note that the severity and accident type are set to, for example, the severity and accident type of the most serious accident among the accidents that occurred at the location. This accident information is acquired, for example, by a device or system that provides accident information.

At this time, the calculation unit 102 refers to the occurrence location of the accident information to determine the location of the accident that occurred on the route searched by the route search unit 112 (or around the route (that is, within a predetermined range from the route)). After specifying the accident information, the demerit points, the first coefficient, and the second coefficient are specified using the specified accident information according to Tables 2 to 4 below. Note that tables corresponding to each of Tables 2 to 4 are stored in the storage unit 120, for example.

そして、算出部１０２は、事故情報毎に、減点基準点×第１の係数×第２の係数により減点数を計算した上で、これらの減点数の合計を、カテゴリＹ２「事故多発地点判定」の減点数の合計とする。

Then, the calculation unit 102 calculates the number of demerit points for each accident information by the demerit point reference points x the first coefficient x the second coefficient, and then calculates the sum of these demerit points as category Y2 "accident-prone spot determination". The total number of deduction points.

For example, assuming that accident information A and accident information B are specified as accident information of accidents that occurred in the past on the route searched by the route search unit 112 (or around the route), accident information A has a "high" occurrence frequency, Assume that the severity level is "medium", the accident type is "serious injury", and the accident information B is that the frequency of occurrence is "medium", the severity level is "small", and the accident type is "slight injury". In this case, the number of demerit points related to accident information A is 5×1.2×1.2=7.2, and the number of demerit points related to accident information B is 2×1.1×1.1=2.42. Therefore, the total number of demerit points in this case is 9.62.

Note that if various types of accidents have occurred in the past on the route searched by the route search unit 112 (or in the vicinity thereof), multiple pieces of accident information are identified at the same location but with different accident types. . In this case, for example, the number of demerit points may be calculated by employing the accident type with the highest value of the second coefficient among the plurality of pieces of accident information. That is, for example, if an accident with an accident type of "serious injury" and an accident with an accident type of "minor injury" have occurred in the past at the same location, the second coefficient corresponding to the accident type of "serious injury" is "1.2". ” to calculate the number of demerit points related to accident information at the location of occurrence.

- Method for calculating the total number of demerit points for category Y3 "angle determination" The calculation unit 102 determines the direction of the route with respect to the traveling direction of the vehicle at the determination point included in the route searched by the route search unit 112. Here, the determination point is a point for determining the direction of the route with respect to the traveling direction of the vehicle, and includes, for example, a node at a point of contact between links. At this time, the calculation unit 102 calculates, for example, the traveling direction of the vehicle immediately before the vehicle enters the determination point along the route (that is, the direction of the immediately previous link), and the link that the vehicle has entered after passing through the determination point. The direction of the route is determined using the angle between the direction of the vehicle and the direction in which the vehicle exits.

For example, the traveling direction of the vehicle immediately before it enters the determination point is set to 0°, and the direction in which the vehicle exits the link that it has entered after passing through the determination point is set to θ. At this time, as shown in Figure 4, if θ≧315° or θ≦45°, the direction of the route is “Go straight”, and if “45°<θ≦135°”, the direction of the route is If “225°≦θ<315°”, set the direction of the route to “turn left”; if “135°<θ≦170°”, set the direction of the route to “rear right” or “190°” If .

Then, the calculation unit 102 uses the direction of the route to calculate the total number of demerit points according to Table 5 below. Note that a table corresponding to this Table 5 is stored in the storage unit 120, for example.

例えば、経路探索部１１２により探索された経路には５つの判定ポイントが含まれ、これら５つの判定ポイントで判定された経路の方向がそれぞれ「直進」、「直進」、「右折」、「直進」、「左折」、「直進」であったとする。この場合、減点数の合計は、０＋０＋１＋０＋０．５＋０＝１．５となる。

For example, the route searched by the route search unit 112 includes five determination points, and the directions of the route determined by these five determination points are "go straight,""gostraight,""turnright," and "go straight," respectively. , "turn left", and "go straight". In this case, the total number of deduction points is 0+0+1+0+0.5+0=1.5.

- Calculation method for the total number of demerit points for category Y4 "road grade determination" The calculation unit 102 performs road grade determination based on the road type and road width of the link included in the route searched by the route search unit 112, and the search target flag. Then, it is determined whether the link is subject to point deduction. For example, the calculation unit 102 determines whether each link included in the route searched by the route search unit 112 has a road type of “narrow street” or a narrow road (for example, the number of lanes is less than a predetermined number or the road width is narrow). or the search target flag is "1" (in other words, a value indicating that it is not used for route searching), and selects the corresponding link. It is determined that the link is subject to point deduction.

Then, the calculation unit 102 calculates the total number of deducted points using Table 6 below, where L is the total link length (distance) of the links subject to deducted points. Note that a table corresponding to this Table 6 is stored in the storage unit 120, for example.

例えば、Ｌが８００ｍであった場合、減点数の合計は５となる。同様に、Ｌが３０００ｍであった場合は減点数の合計は１０、Ｌが６０００ｍであった場合は減点数の合計は２０となる。

For example, if L is 800m, the total number of deductions will be 5. Similarly, if L is 3000 m, the total number of demerit points will be 10, and if L is 6000 m, the total number of demerit points will be 20.

<Route guidance processing>
Next, route guidance processing according to this embodiment will be explained with reference to FIG. 5. FIG. 5 is a flowchart illustrating an example of route guidance processing according to this embodiment.

First, the condition setting section 111 of the route guidance processing section 110 sets search conditions (step S101). Note that, as described above, the search conditions include at least the starting point and the destination. In addition to these, the search conditions may also include, for example, departure date and time, transit points, weather, and whether toll roads are used.

Next, the route search unit 112 of the route guidance processing unit 110 searches for one or more routes from the departure point to the destination based on the search conditions set in step S101 above (step S102). At this time, the route search unit 112 uses a known algorithm such as Dijkstra's method to search for a route that minimizes the cost from the departure point to the destination (for example, the sum of link cost and intersection cost is the minimum).

Here, in addition to the link cost and the intersection cost, an accident cost may be used as the above cost. The accident cost is a cost determined from the accident type, severity, occurrence frequency, etc. of the accident information stored in the storage unit 120. For example, the accident cost increases in the order of accident type: "death", "serious injury", and "minor injury". Also, for example, the greater the severity and the higher the frequency of occurrence, the higher the accident cost.

By using accident costs, it is possible to search for routes that avoid places where accidents occur frequently or places where serious accidents have occurred. Note that when determining the accident cost, accident information used for determining the accident cost may be extracted from the storage unit 120 based on the search conditions set in step S101 above.

For example, if the search condition set in step S101 above includes the departure date and time, extract the accident information that includes the departure date and time as the time period in which the accident occurred from among the accident information stored in the storage unit 120. You may. In addition to this, for example, the storage unit may Among the accident information stored in 120, accident information of an accident that occurred when the condition was met may be extracted. This makes it possible to perform a route search that takes into consideration the accident costs of accidents that may occur under the conditions set as the search conditions.

Next, the calculation unit 113 of the route guidance processing unit 110 calculates the kindness level of each route searched in step S102 above, using the kindness level calculation method described above (step S103).

Finally, the display control unit 114 of the route guidance processing unit 110 uses the route searched in step S102 described above and the degree of kindness calculated in step S103 described above to determine the route and the degree of kindness of the route. A route guidance screen (for example, route guidance screen 1000 as shown in FIG. 1) including the following is displayed (step S104). As a result, the user is presented with a route from the departure point to the destination and a level of friendliness indicating the ease of driving this route. Therefore, the user can select an easy-to-drive route and receive route guidance based on the selected route.

The display control unit 114 also refers to the accident information stored in the storage unit 120 to display icons indicating frequent accident points (or points where serious accidents have occurred) on the route searched in step S102 above. indicate. At this time, the display control unit 114 refers to the accident information stored in the storage unit 120 and selects, for example, among past accidents that occurred on the route, accidents with a predetermined frequency of occurrence or more, or accidents with a predetermined severity. An icon is displayed at the point where the above accidents have occurred as a point where many accidents occur (or a point where a serious accident has occurred). At this time, if accident cost is used in the route search in step S102 above, among the accident information used to determine the accident cost, accidents with an occurrence frequency of a predetermined level or more or a severity of a predetermined level or more are selected. A point where an accident has occurred, which is represented by the accident information, may be set as a point where many accidents occur (or a point where a serious accident has occurred).

Further, the display control unit 114 may, for example, change the types of icons indicating frequent accident locations (or locations where serious accidents have occurred) depending on the accident type. For example, the display control unit 114 may display an icon that simply represents the content of the accident type, depending on the accident type.

In addition, in this embodiment, the friendliness degree of the route searched at the time of route search is calculated, but it is not limited to this. For example, the friendliness degree of the route searched by this reroute may also be calculated at the time of so-called reroute. Good too. Note that reroute is a function or process of re-searching for a route based on the user's current location, for example, when the user's current location deviates from the route.

<Hardware configuration>
Finally, the hardware configuration of the route guidance device 10 according to this embodiment will be explained with reference to FIG. 6. FIG. 6 is a diagram showing an example of the hardware configuration of the route guidance device 10 according to this embodiment.

As shown in FIG. 6, the route guidance device 10 according to the present embodiment includes an input device 201, a display device 202, a RAM (Random Access Memory) 203, a ROM (Read Only Memory) 204, and an external I/F 205. , a communication I/F 206 , a processor 207 , and an auxiliary storage device 208 . These pieces of hardware are connected to each other via bus B so that they can communicate with each other.

The input device 201 is, for example, a keyboard, a mouse, a touch panel, various buttons, etc., and is used by the user to perform various inputs to the route guidance device 10. The display device 202 is, for example, a display or the like, and displays the processing results of the route guidance device 10 (for example, the route guidance screen 1000, etc.).

The RAM 203 is a volatile semiconductor memory that temporarily holds programs and data. The ROM 204 is a nonvolatile semiconductor memory that can retain programs and data even when the power is turned off. The ROM 204 stores, for example, setting information regarding the OS (Operating System), setting information for connecting to a communication network, and the like.

External I/F 205 is an interface with an external device. The external device includes a recording medium 205a and the like. The route guidance device 10 can read, write, etc. on the recording medium 205a via the external I/F 205. The recording medium 205a includes, for example, an SD memory card, a USB memory, and the like.

Communication I/F 206 is an interface for connecting route guidance device 10 to a communication network. The processor 207 is, for example, a CPU (Central Processing Unit), etc., and reads programs and data from the ROM 204, auxiliary storage device 208, etc. onto the RAM 203, and executes processing based on the programs and data, thereby operating the route guidance device. This is an arithmetic device that controls the entire 10 and implements various functions.

The auxiliary storage device 208 is, for example, an HDD (Hard Disk Drive) or an SSD (Solid State Drive), and is a nonvolatile memory that stores programs and data. The programs and data stored in the auxiliary storage device 208 include, for example, an OS, an application program that runs on the OS, and one or more programs that implement the route guidance processing section 110.

The route guidance device 10 according to the present embodiment has the hardware configuration shown in FIG. 6, thereby being able to realize the route guidance processing described above. Note that the hardware configuration shown in FIG. 6 is an example, and the route guidance device 10 according to this embodiment may have other hardware configurations. For example, the route guidance device 10 according to this embodiment may include a positioning device such as a GPS receiver. Further, the route guidance device 10 according to this embodiment may include a plurality of processors 207 or a plurality of memories.

The present invention is not limited to the above-described specifically disclosed embodiments, and various modifications and changes can be made without departing from the scope of the claims.

10 route guidance device 110 route guidance processing unit 111 condition setting unit 112 route search unit 113 calculation unit 114 display control unit 120 storage unit

Claims (8)

Search means for searching one or more routes from the departure point to the destination based on search conditions that include at least a departure point and a destination;
Calculating means for calculating, for each of the one or more routes searched by the searching means, an index value representing the ease of driving the vehicle when the route is driven by a vehicle;
Display means for displaying each of the one or more routes searched by the search means and an index value calculated by the calculation means for each of the one or more routes in association with each other;
has
The search conditions include at least the departure time , the month and day of the departure time, the day of the week of the departure time, the weather of the departure time, information indicating whether the departure time is a holiday, and the road surface condition of the departure time. further includes a condition containing one of
The searching means is
Among the accident information stored in the storage unit, at least one of the time period when the accident represented by the accident information occurred, month and day, day of the week, weather, whether it is a holiday, and road surface condition meets the conditions. Searching for the route using the accident cost included in the matching accident information,
The route guidance system is characterized in that the accident cost is determined from the accident type, severity, and occurrence frequency of the accident represented by the accident information . The calculation means is
a first score determined according to the direction of the route at a predetermined determination point included in the route; and a second score determined according to an accident that occurred in the past on or around the route. 2. The route guidance system according to claim 1, wherein the index value is calculated based on a third score determined according to a road width grade of a road included in the route. The calculation means is
A value obtained by subtracting the first score from a predetermined first score distribution, a value obtained by subtracting the second score from a predetermined second distribution score, and a value obtained by subtracting the second score from a predetermined third distribution score. 3. The route guidance system according to claim 2, wherein the index value is a total value including a value obtained by subtracting a third score. The display means is
Any one of claims 1 to 3, characterized in that an icon indicating that accidents have frequently occurred in the past on or around the route or an icon indicating that a serious accident has occurred is further displayed. The route guidance system according to paragraph 1. The searching means is
The road network information stored in the storage unit is further referred to to determine the link cost and node cost included in the road network information, and the accident type, severity, and occurrence frequency included in the accident information. 5. The route is searched using the accident cost such that the sum of the link cost, the node cost, and the accident cost is minimized. The route guidance system described in . Search means for searching one or more routes from the departure point to the destination based on search conditions that include at least a departure point and a destination;
Calculating means for calculating, for each of the one or more routes searched by the searching means, an index value representing the ease of driving the vehicle when the route is driven by a vehicle;
Display means for displaying each of the one or more routes searched by the search means and an index value calculated by the calculation means for each of the one or more routes in association with each other;
has
The search conditions include at least the departure time , the month and day of the departure time, the day of the week of the departure time, the weather of the departure time, information indicating whether the departure time is a holiday, and the road surface condition of the departure time. further includes a condition containing one of
The searching means is
Among the accident information stored in the storage unit, at least one of the time period when the accident represented by the accident information occurred, month and day, day of the week, weather, whether it is a holiday, and road surface condition meets the conditions. Searching the route using the accident cost included in the matching accident information,
The route guidance device characterized in that the accident cost is a cost determined from the accident type, severity, and occurrence frequency of the accident represented by the accident information . a search procedure for searching one or more routes from the departure point to the destination based on search conditions that include at least a departure point and a destination;
a calculation step of calculating, for each of the one or more routes searched in the search step, an index value representing the ease of driving the vehicle when the route is driven by a vehicle;
a display step of displaying each of the one or more routes searched in the search step and the index value calculated in the calculation step for each of the one or more routes;
The computer executes
The search conditions include at least the departure time , the month and day of the departure time, the day of the week of the departure time, the weather of the departure time, information indicating whether the departure time is a holiday, and the road surface condition of the departure time. further includes a condition containing one of
The search procedure is
Among the accident information stored in the storage unit, at least one of the time period when the accident represented by the accident information occurred, month and day, day of the week, weather, whether it is a holiday, and road surface condition meets the conditions. Searching the route using the accident cost included in the matching accident information,
A route guidance method characterized in that the accident cost is determined from the accident type, severity, and occurrence frequency of the accident represented by the accident information . a search procedure for searching one or more routes from the departure point to the destination based on search conditions that include at least a departure point and a destination;
a calculation step of calculating, for each of the one or more routes searched in the search step, an index value representing the ease of driving the vehicle when the route is driven by a vehicle;
a display step of displaying each of the one or more routes searched in the search step and the index value calculated in the calculation step for each of the one or more routes;
make the computer run
The search conditions include at least the departure time , the month and day of the departure time, the day of the week of the departure time, the weather of the departure time, information indicating whether the departure time is a holiday, and the road surface condition of the departure time. further includes a condition containing one of
The search procedure is
Among the accident information stored in the storage unit, at least one of the time period when the accident represented by the accident information occurred, month and day, day of the week, weather, whether it is a holiday, and road surface condition meets the conditions. Searching the route using the accident cost included in the matching accident information,
The program characterized in that the accident cost is determined from the accident type, severity, and occurrence frequency of the accident represented by the accident information .

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