JP4506887B2 - Server, control method thereof, program - Google Patents

Description

  The present invention relates to a server that guides an optimum route based on traffic information such as a traffic jam in route search for a car navigation system, a control method thereof, and a program.

  Conventionally, as a method of providing traffic information from an external system (information providing center) via a wide-area communication network such as a mobile phone to the car navigation system, VICS (Vehicle Information and Information) operated by the Road Traffic Information Communication System Center Communication System) and Internavi (registered trademark) premium club operated by Honda Motor Co., Ltd.

  VICS installs traffic flow measurement sensors, radio beacons, optical beacons, etc. on the road, detects the flow of vehicles based on the traffic flow measurement sensors, recognizes traffic conditions, and uses radio beacons, optical beacons, FM Traffic information is provided from the information provision center to the car navigation system using multiplex communication.

  In addition, in addition to the above VICS, the Internavi (registered trademark) Premium Club uses a mobile phone to accumulate the travel status of one's own vehicle, and the communication timing when using some other telematics service. At the same time, the accumulated driving conditions (location, travel time, etc.) are sent to an external system (information provision center), and from the external system (information provision center) via a mobile phone based on the driving conditions collected from each vehicle. It provides traffic information to the car navigation system upon request from the driver.

Furthermore, the invention disclosed in Patent Document 1 is known as a route search based on traffic information. This Patent Document 1 discloses a route search system that can provide the same route information without managing the search results for each user on the server side and even in the case of a re-search request for the same route at different times. The provided invention is disclosed.
JP 2004-205237 A

  However, the conventional techniques described above have the following problems.

  First, in the case of VICS, it is necessary to install a traffic flow measurement sensor or the like on the road. That is, it has been impossible to collect / provide traffic information on a road where no sensor is installed. Moreover, enormous costs are required to install sensors on all roads.

  In addition, the Internavi (registered trademark) premium club transmits the traveling state (position, travel time, etc.) of the vehicle regardless of whether there is traffic. For this reason, the amount of communication between the external system (information providing center) and the car navigation system is increasing. Therefore, since the communication is performed even in a situation where the user does not need much information such as when there is no traffic jam, a large load is continuously applied to the entire system.

  Furthermore, since the route search function is arranged on the server and the route search result is transmitted to the car navigation system, the invention of Patent Document 1 has not yet reduced the amount of communication. In addition, since the route search at the server is performed in response to a search request from the car navigation (user terminal) side, the operation may be complicated for the user.

  In view of such a problem, an object of the present invention is to provide a server, a control method thereof, and a program that are easy to use and can reduce the load on the server and search for an optimum route.

  In order to achieve the above object, the invention described in claim 1 is a server for searching for a guidance route to a destination of a vehicle, accumulates past traffic jam information, and predicts traffic jam from the accumulated traffic jam information. A traffic jam prediction information generating unit that generates information, a destination setting information storage unit that receives and stores destination setting information related to a guidance route transmitted from each vehicle to a destination, and an arbitrary point in the guidance route Passing time difference calculating means for calculating the time difference between the predicted passing time and the actual passing time, a determining means for comparing the preset threshold value with the time difference to determine whether or not the time difference exceeds the threshold value, and the time difference exceeds the threshold value Delay determination means for determining that there is a delay in the time difference with respect to the predicted passage time, and if it is determined that there is a delay, the delay information is obtained from the time difference and the position information at the time of the delay determination. Among the vehicles provided with the delay information generating means for generating the traffic jam prediction information and the traffic jam prediction update information generating means for generating the traffic jam prediction update information by associating the traffic jam prediction information with the delay information, the first vehicle transmits the information. And a traffic jam prediction information updating means for receiving the traffic jam prediction update information and updating the traffic jam prediction information.

  The invention according to claim 2 is a server control method for searching a guidance route to a destination of a vehicle, which accumulates past traffic jam information and generates traffic jam prediction information from the accumulated traffic jam information. Prediction information generation step, destination setting information storage step for receiving and storing destination setting information related to the guidance route transmitted from each vehicle to the destination, and estimated passing time and actual at any point in the guidance route The time difference with the passage time is calculated and a preset threshold value is compared with the time difference to determine whether or not the time difference exceeds the threshold value. If the time difference exceeds the threshold value, the time is compared with the predicted passage time. When it is determined that there is a delay in the difference, and it is determined that there is a delay, the time difference and the position information at the time of the delay determination are generated as delay information, and the traffic jam prediction information is updated in association with the delay information. Astringent Of the vehicle for generating a prediction update information, and receiving the traffic jam prediction update information transmitted from the first vehicle, and traffic jam prediction information updating step of updating the traffic jam prediction information, and having a.

  The invention according to claim 3 relates to a traffic jam prediction information generation process for accumulating past traffic jam information and generating traffic jam prediction information from the accumulated traffic jam information, and a guidance route from each vehicle to a destination. Destination setting information storage processing for receiving and storing destination setting information, and calculating the time difference between the predicted passing time and the actual passing time at any point in the guidance route, and calculating a preset threshold and time difference. A comparison is made to determine whether or not the time difference exceeds a threshold value. If the time difference exceeds the threshold value, it is determined that there is a delay in the time difference with respect to the predicted passage time, and it is determined that there is a delay. In this case, the time difference and the position information at the time of delay determination are generated as delay information, and the traffic jam prediction information is updated in association with the delay information to generate the traffic jam prediction update information, which is transmitted from the first vehicle. Be done Stagnation receives prediction update information, characterized in that to perform a congestion prediction information updating process for updating the traffic jam prediction information, to the computer.

  As described above, according to the server, the control method, and the program of the present invention, it is easy to use and it is possible to search for an optimum route while reducing the load on the server.

  Below, the navigation system of this embodiment is demonstrated using drawing. The navigation system of the present embodiment is not limited to the one described below, and various modifications can be made without departing from the spirit of the navigation system.

  As shown in FIG. 1, the navigation system according to the present embodiment includes a host vehicle 10, other vehicles (30, 40, 50), a car navigation system (11, 31, 41, 51), and traffic information collection / provision. And system 20. Each vehicle (the own vehicle 10 and the other vehicles 30 to 50) is equipped with each car navigation system (11, 31, 41, 51), and the network 100 is connected to the traffic information collection / provision system 20. Communication will be performed via.

  In FIG. 1, the own vehicle 10 uses a car navigation system 11 to set a desired destination as a destination. Then, based on the traffic jam prediction information calculated according to the past traffic jam information installed in the car navigation system 11, the shortest time path from the current location of the host vehicle 10 to the destination is searched and guided. At this time, setting information on the current location and the destination of the vehicle 10 is transmitted to the external traffic information collection / provision system 20 via the network 100 which is a wide area communication network such as a mobile phone.

  Other vehicles 30, 40, 50 and car navigation systems 31, 41, 51 also operate in the same manner as described above.

  As each vehicle 10, 30, 40, 50 continues to travel according to the searched shortest route, one of the vehicles enters a sudden traffic jam that is not predicted in the traffic jam prediction information. In this case, there will be a delay beyond a certain threshold from the estimated passage time based on the travel time prediction originally searched. Each car navigation system recognizes this as a sudden traffic jam.

  Information about this delay is transmitted to the traffic information collection / provision system 20 via the network 100. The traffic information collecting / providing system 20 is based on the destination setting information from the corresponding vehicle, and the traffic jam prediction information in which the sudden traffic jam information is added to each vehicle that is about to reach the location where the sudden traffic jam occurs. Is sent to each car navigation system. Then, the car navigation system that has received this information searches and guides the shortest time route according to the new traffic jam prediction information.

  Below, the navigation system in this embodiment is demonstrated in detail, referring drawings for every embodiment.

[First Embodiment]
FIG. 2 is a block diagram showing the configuration of the first embodiment.

  In the navigation system according to the first embodiment, as shown in FIG. 2, the host vehicle 10 and the other vehicles 30 and 40 are connected to the traffic information collection / provision system 20 via the network 100. Each vehicle (the own vehicle 10 and the other vehicles 30, 40) is equipped with each car navigation system (11, 31, 41) and communicates with the traffic information collection / provision system 20 become.

  A car navigation system 11 is mounted on the host vehicle 10. The car navigation system 11 includes a route search function 12 that calculates the shortest time route and travel time to the destination, and a traffic jam prediction database (hereinafter referred to as DB) that provides relevant traffic jam prediction information when calculating the shortest time route and travel time. Abbreviated as 13). Further, the traffic jam prediction information provided from the traffic jam prediction DB 13 is stored in advance in the DB.

  The traffic information collection / provision system 20 includes a traffic jam prediction DB 22 that is a function equivalent to the traffic jam prediction DBs 12, 32, and 42 mounted on the car navigation systems 11, 31, and 41. Furthermore, a destination setting information DB 25 for managing route information between the destination and the current location at the time of setting the destination set by each car navigation system 11, 31, 41 is provided. The traffic information collecting / providing system 20 is composed of the traffic jam prediction DB 22 and the destination setting information DB 25 described above.

  The car navigation system 31 is mounted on the other vehicle 30 in the same manner as the host vehicle 10 described above. The car navigation system 31 includes a route search function 32 that calculates the shortest time route and travel time to the destination, and a traffic jam prediction DB 33 that provides relevant traffic jam prediction information when calculating the shortest time route and travel time. Has been. Further, the car navigation system 31 compares the shortest time route and travel time calculated by the route search function 32 with the current location and the current time when the other vehicle 30 is currently traveling, and based on the comparison result, Is provided with a delay determination function 34 for detecting whether or not a delay occurs.

  The other vehicle 40 is also equipped with a car navigation system 41 as with the other vehicle 30. The car navigation system 41 includes a route search function 42, a traffic congestion prediction DB 43, a delay determination function 44, which are the same functions as the route search function 32, the traffic congestion prediction DB 33, and the delay determination function 34, respectively. It consists of

  Each car navigation system 11, 31, 41 is connected to the traffic information collection / provision system 20 via the network 100. As described above, the network 100 is a wide area communication network such as a mobile phone.

Next, the operation according to the first embodiment will be described with reference to the drawings.
FIG. 3 is a sequence chart showing the operation of the first embodiment.

  First, a destination is set by the car navigation system 11 of the host vehicle 10 (step A1). When processing the route search, calculation is performed using the estimated link passage time accumulated in the traffic jam prediction DB 13 as shown in FIG. 4 (step A2).

  At this time, as the calculated destination setting information, the current location and destination of the vehicle 10 and the route search result in the shortest time are transmitted to the traffic information collection / provision system 20 via the network 100 (step A3). . After transmitting the destination setting information in this way, the host vehicle 10 continues to travel according to the route guidance according to the route search result (step A4 ′).

  On the other hand, when receiving the destination setting information from the car navigation system 11 (step A4), the traffic information collecting / providing system 20 stores the received information in the destination setting information DB 25 (step A5). At this time, if destination setting information is received from the car navigation systems 31 and 41 other than the own vehicle 10, the received information is similarly stored in the destination setting information DB 25 (step A3 ').

  In this state, it is assumed that, for example, another vehicle 40 enters a traffic jam while each vehicle continues to travel according to the route guidance based on the destination setting information (step A6). Then, the delay determination function 44 of the car navigation system 41 compares the predicted passing time at the point with the actual passing time based on the calculated shortest time route and travel time.

  Here, it is assumed that the comparison result is delayed by 2 minutes (step A7). If the delay determination function 44 is set to determine that a delay has occurred with respect to a delay of 3 minutes or more as a delay-related threshold value, the delay determination function 44 does not determine a delay. After that, it is determined whether there is any other delay (step A8). Note that the user can set the threshold regarding delay.

  Furthermore, in this state, it is assumed that the other vehicle 30 has entered another traffic jam (step A9). Then, the delay determination function 34 of the car navigation system 31 compares the predicted passing time at the point with the actual passing time based on the calculated shortest time route and travel time.

  Here, it is assumed that the comparison result is delayed by 5 minutes (step A10). Then, if the delay determination function 34 is set to determine that a delay has occurred for a delay of 3 minutes or more as a delay threshold value, as in the case of the delay determination function 44, it is determined that a delay has occurred. (Step A11). At this time, the car navigation system 31 transmits the current location of the other vehicle 30 and the determination result indicating that the generated delay time is 5 minutes to the traffic information collecting / providing system 20 (step A12).

  In addition, when the delay of the following other vehicle returns to 3 minutes or less of the threshold value regarding the delay, it is indicated that the delay is the same as the operation in the other vehicle 40 in the first embodiment. It is not transmitted to the providing system 20. Therefore, subsequent vehicles will not receive traffic jam information.

  The traffic information collection / provision system 20 receives from the car navigation system 31 the current location of the other vehicle 30 and a determination result indicating that the generated delay time is 5 minutes (step A13). Next, the predicted passing time of the road located at the current location of the other vehicle 30 in the traffic jam prediction DB 23 is updated to the generated delay time of 5 minutes (step A14).

  Here, the destination setting information DB 25 is referenced to search for a vehicle that is about to enter the current location of the other vehicle 30 where the delay has occurred (step A15). This time, it recognizes that the own vehicle 10 corresponds. Then, only the information on the portion where the traffic jam prediction DB 23 is updated, that is, the portion updated due to the delay of the other vehicle 30, is transmitted to the car navigation system 11 (step A16).

  When the car navigation system 11 receives the update data of the traffic jam prediction DB 23 transmitted from the traffic information collection / provision system 20 (step A17), the car navigation system 11 updates the information held in the traffic jam prediction DB 13 to this update data (step A18). . Then, the car navigation system 11 re-searches the shortest time path from the current location of the host vehicle 10 to the destination based on the updated traffic jam prediction DB 13 (step A19). Finally, route guidance is performed based on the re-search result (step A20).

  Note that the traffic jam prediction information provided from each traffic jam prediction DB is updated so that the traffic jam information of all vehicles passing through the same route is the same. In other words, the traffic jam information is not updated for vehicles that do not plan to pass the same route. This is because, for example, when the own vehicle 10 is traveling on a road in Hokkaido toward a destination in Hokkaido, even if another vehicle 40 enters a traffic jam on a road in Okinawa, this traffic jam in Okinawa This is because there is no need to update the information. This is because updating the irrelevant traffic jam information between vehicles that are scheduled to pass through different routes places an extra load on the network.

  As described above, according to the navigation system of the first embodiment, another vehicle that has entered before the host vehicle 10 (the other vehicle 30 in the first embodiment) detects the traffic jam, and immediately transmits the traffic jam information. It can be provided to the vehicle 10 via the traffic information collection / provision system 20. Therefore, even if a traffic jam occurs on the road that will be passed, it is possible to recognize the traffic jam information in advance and avoid entering the traffic jam.

  Furthermore, according to the navigation system of the first embodiment, traffic jam information is transmitted only when a traffic jam occurs, and the transmitted traffic jam information is received only by vehicles that are about to enter a traffic jam road. become. Therefore, it is possible to reduce the traffic / charge through the network when transmitting real-time traffic jam information to the car navigation system.

[Second Embodiment]
Further, according to the navigation system in the present embodiment, when not only the other vehicle 30 or the other vehicle 40 but also the own vehicle 10 enters the traffic jam, the traffic jam information is transmitted from the own vehicle 10 side, It is possible to update the data of the vehicle 30 and the other vehicle 40. In the second embodiment, the case where the vehicle 10 detects traffic jam information will be described in more detail with reference to the drawings.

  FIG. 6 is a block diagram illustrating a configuration of the second embodiment. In the configuration of the second embodiment, a delay determination function 14 is added to the car navigation system 11 mounted on the host vehicle 10, and the basic configuration is the same as that of the first embodiment. is there.

  In the navigation system according to the second embodiment, as shown in FIG. 6, the host vehicle 10 and the other vehicles 30 and 40 are connected to the traffic information collection / provision system 20 via the network 100. Each vehicle (the own vehicle 10 and the other vehicles 30, 40) is equipped with each car navigation system (11, 31, 41) and communicates with the traffic information collection / provision system 20 become.

  A car navigation system 11 is mounted on the host vehicle 10. The car navigation system 11 includes a route search function 12 that calculates the shortest time route and travel time to the destination, and a traffic jam prediction database (hereinafter referred to as DB) that provides relevant traffic jam prediction information when calculating the shortest time route and travel time. Abbreviated as 13). Further, the traffic jam prediction information provided from the traffic jam prediction DB 13 is stored in advance in the DB. Furthermore, in the second embodiment, the shortest time route and travel time calculated by the route search function 12 are compared with the current location and current time when the host vehicle 10 is currently traveling, and a certain fixed value is obtained from this comparison result. A delay determination function 14 for detecting whether or not the above delay has occurred is provided.

  The traffic information collection / provision system 20 includes a traffic jam prediction DB 22 that is a function equivalent to the traffic jam prediction DBs 12, 32, and 42 mounted on the car navigation systems 11, 31, and 41. Furthermore, a destination setting information DB 25 for managing route information between the destination and the current location at the time of setting the destination set by each car navigation system 11, 31, 41 is provided. The traffic information collecting / providing system 20 is composed of the traffic jam prediction DB 22 and the destination setting information DB 25 described above.

  The car navigation system 31 is mounted on the other vehicle 30 in the same manner as the host vehicle 10 described above. The car navigation system 31 includes a route search function 32 that calculates the shortest time route and travel time to the destination, and a traffic jam prediction DB 33 that provides relevant traffic jam prediction information when calculating the shortest time route and travel time. Has been. Further, the car navigation system 31 compares the shortest time route and travel time calculated by the route search function 32 with the current location and the current time when the other vehicle 30 is currently traveling, and based on the comparison result, Is provided with a delay determination function 34 for detecting whether or not a delay occurs.

  The other vehicle 40 is also equipped with a car navigation system 41 as with the other vehicle 30. The car navigation system 41 includes a route search function 42, a traffic congestion prediction DB 43, a delay determination function 44, which are the same functions as the route search function 32, the traffic congestion prediction DB 33, and the delay determination function 34, respectively. It consists of

  Each car navigation system 11, 31, 41 is connected to the traffic information collection / provision system 20 via the network 100. The network 100 is a wide area communication network such as a mobile phone.

Next, an operation according to the second embodiment will be described with reference to the drawings.
FIG. 7 is a sequence chart showing the operation of the second embodiment.

  First, a destination is set by the car navigation system 11 of the host vehicle 10 (step B1). When the route search is processed, calculation is performed using the predicted link passage time accumulated in the traffic jam prediction DB 13 as shown in FIG. 4 (step B2).

  At this time, as the calculated destination setting information, the current location and destination of the vehicle 10 and the route search result in the shortest time are transmitted to the traffic information collection / provision system 20 via the network 100 (step B3). . After transmitting the destination setting information in this way, the vehicle 10 continues to travel according to the route guidance according to the route search result (step B4 ′).

  On the other hand, when receiving the destination setting information from the car navigation system 11 (step B4), the traffic information collecting / providing system 20 stores the received information in the destination setting information DB 25 (step B5). At this time, if the destination setting information is received from the car navigation systems 31, 41 other than the own vehicle 10, the received information is similarly stored in the destination setting information DB 25 (step B3 ').

  In this state, it is assumed that, for example, another vehicle 40 enters a traffic jam while each vehicle continues to travel according to the route guidance based on the destination setting information (step B6). Then, the delay determination function 44 of the car navigation system 41 compares the predicted passing time at the point with the actual passing time based on the calculated shortest time route and travel time.

  Here, it is assumed that the comparison result is delayed by 2 minutes (step B7). If the delay determination function 44 is set to determine that a delay has occurred with respect to a delay of 3 minutes or more as a delay-related threshold value, the delay determination function 44 does not determine a delay. After that, it is determined whether or not another delay occurs (step B8). Note that the user can set the threshold regarding delay.

  Furthermore, in this state, it is assumed that the vehicle 10 itself has entered another traffic jam (step B9). Then, the delay determination function 14 of the car navigation system 11 compares the predicted passing time at the point with the actual passing time based on the calculated shortest time route and travel time.

  Here, it is assumed that the comparison result is delayed by 5 minutes (step B10). Then, if the delay determination function 14 is set to determine that a delay has occurred for a delay of 3 minutes or more as a delay threshold value as the delay determination function 44, it is determined that a delay has occurred. (Step B11). At this time, the car navigation system 11 transmits the current location of the host vehicle 10 and the determination result indicating that the generated delay time is 5 minutes to the traffic information collecting / providing system 20 (step B12).

  In addition, when the delay of the following other vehicle returns to 3 minutes or less of the threshold value related to the delay, it is indicated that the delay is similar to the operation of the other vehicle 40 in the second embodiment. It is not transmitted to the providing system 20. Therefore, subsequent vehicles will not receive traffic jam information.

  The traffic information collection / provision system 20 receives from the car navigation system 11 the current location of the host vehicle 10 and a determination result indicating that the generated delay time is 5 minutes (step B13). Next, the predicted passing time of the road located at the current location of the own vehicle 10 in the traffic jam prediction DB 23 is updated to 5 minutes which is the generated delay time (step B14).

  Here, the destination setting information DB 25 is referenced to search for a vehicle that is about to enter the current location of the host vehicle 10 where the delay has occurred (step B15). This time, it recognizes that the other vehicle 30 corresponds. Then, only the information on the portion where the traffic jam prediction DB 23 is updated, that is, the portion updated due to the delay of the host vehicle 10, is transmitted to the other vehicle 30 (step B16).

  When the car navigation system 31 receives the update data of the traffic jam prediction DB 23 transmitted from the traffic information collecting / providing system 20 (step B17), the car navigation system 31 updates the information held in the traffic jam prediction DB 33 to this update data (step B18). . Then, the car navigation system 31 re-searches the shortest time path from the current location of the other vehicle 30 to the destination based on the updated traffic jam prediction DB 33 (step B19). Finally, route guidance is performed based on the re-search result (step B20).

  As described above, according to the navigation system of the second embodiment, the traffic information can be transmitted from the vehicle 10 side even when the vehicle 10 enters the traffic jam. Therefore, it becomes possible to transmit the updated traffic information data to the other vehicle 30 or the other vehicle 40 that uses the same route as the host vehicle 10.

  In the first and second embodiments described above, if the result of re-searching the route after updating the congestion prediction DB is determined that the route currently being guided is optimal, the guidance route is not changed. become.

It is a block diagram which shows the structure of the navigation system in this embodiment. It is a block diagram which shows the structure of the navigation system in 1st Embodiment. It is a sequence chart which shows operation | movement of the navigation system in 1st Embodiment. It is a schematic diagram which shows the data accumulate | stored in each congestion prediction DB in this embodiment. It is a schematic diagram which shows the data accumulate | stored in each congestion prediction DB in this embodiment. It is a block diagram which shows the structure of the navigation system in 2nd Embodiment. It is a sequence chart which shows operation | movement of the navigation system in 2nd Embodiment.

Explanation of symbols

10 Own vehicle 11, 31, 41, 51 Car navigation system 12, 32, 42 Route search function 13, 23, 33, 43 Congestion prediction database (DB)
14, 34, 44 Delay determination function 20 Traffic information collection / provision system 25 Destination setting information database (DB)
30, 40, 50 Other vehicles 100 Network

Claims (3)

A server that searches for a guidance route to a vehicle destination,
Congestion prediction information generation means for accumulating past congestion information and generating congestion prediction information from the accumulated congestion information;
Destination setting information accumulating means for receiving and accumulating destination setting information relating to the guidance route to the destination transmitted from each vehicle;
Passing time difference calculating means for calculating a time difference between a predicted passing time and an actual passing time at an arbitrary point in the guidance route, whether or not the time difference exceeds the threshold by comparing a preset threshold with the time difference Determining means for determining whether the time difference exceeds the threshold, delay determining means for determining that a delay of the time difference has occurred with respect to the predicted passage time, determining that the delay has occurred In this case, delay information generating means for generating the time difference and position information at the time of delay determination as delay information, and traffic jam prediction for updating the traffic jam prediction information in association with the delay information and generating traffic jam prediction update information Among the vehicles provided with update information generation means, the traffic jam prediction information update that receives the traffic jam prediction update information transmitted from the first vehicle and updates the traffic jam prediction information. And means,
The server characterized by having. A server control method for searching a guidance route to a vehicle destination,
Congestion prediction information generation step of accumulating past traffic jam information and generating traffic jam prediction information from the accumulated traffic jam information,
A destination setting information accumulating step for receiving and accumulating destination setting information relating to the guidance route to each destination transmitted from each vehicle;
Calculate the time difference between the predicted passing time and the actual passing time at any point in the guidance route, and compare the preset threshold value with the time difference to determine whether the time difference exceeds the threshold value. When the time difference exceeds the threshold, it is determined that a delay of the time difference has occurred with respect to the predicted passage time, and when it is determined that the delay has occurred, the time difference and delay determination The traffic jam prediction transmitted from the first vehicle among the vehicles that generate position information at the time point as delay information and update the traffic jam prediction information in association with the delay information to generate traffic jam forecast update information. A traffic jam prediction information update step of receiving update information and updating the traffic jam prediction information;
A server control method characterized by comprising: Congestion prediction information generation processing for accumulating past traffic jam information and generating traffic jam prediction information from the accumulated traffic jam information;
Destination setting information storage processing for receiving and storing destination setting information related to the guidance route to each destination transmitted from each vehicle;
Calculate the time difference between the predicted passing time and the actual passing time at any point in the guide route, and compare the preset threshold value with the time difference to determine whether the time difference exceeds the threshold value. When the time difference exceeds the threshold, it is determined that a delay of the time difference has occurred with respect to the predicted passage time, and when it is determined that the delay has occurred, the time difference and delay determination The traffic jam prediction transmitted from the first vehicle among the vehicles that generate position information at the time as delay information and update the traffic jam prediction information in association with the delay information to generate traffic jam forecast update information. A traffic jam prediction information update process for receiving update information and updating the traffic jam prediction information;
A program for a server that causes a computer to execute.

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