Road-vehicle communication system

The present invention relates to a road-to-vehicle communication system that prevents reverse driving on a toll road.

Conventionally, there is known a road-to-vehicle communication system that is composed of a roadside wireless device installed on the road and an in-vehicle device mounted on a vehicle and performs bidirectional wireless communication between the roadside wireless device and the in-vehicle device. In this road-to-vehicle communication system, for example, a narrow range communication system called DSRC (Dedicated Short Range Communication) is adopted. The on-board unit performs narrow-range wireless communication with the roadside wireless device, and can receive information from the center device via the roadside wireless device. That is, bidirectional communication between the on-board unit and the roadside radio device is possible only while the vehicle is within the communication range of the roadside radio device, and during this time, information is provided from the center device to the on-board unit via the roadside radio device. .. In the above-mentioned road-to-vehicle communication system, for example, information for supporting driving such as an obstacle such as a stopped vehicle in front of the road or a confluence in front of the road can be provided to the on-board unit. It is very effective in preventing traffic accidents.

By the way, in recent years, accidents in which a forward vehicle and a reverse-way vehicle collide with each other on a one-way road such as a toll road (reverse-way accident) have frequently occurred, which has become a problem. This reverse-way accident is, for example, accidentally entering a toll road from an outflow ramp, or reverse-way driving on an approach road when returning to the main line from a service area or parking area (hereinafter referred to as SA / PA). Caused by. As a measure to prevent reverse driving on toll roads, for example, a road sign indicating that the road is a one-way road or a road marking is used to call attention. In addition, a technique has been proposed that warns the driver that the vehicle is running in reverse by using the above-mentioned road-to-vehicle communication system (for example, Patent Document 1). The road-to-vehicle communication system described in Patent Document 1 transmits entrance information from a roadside radio device to an on-board unit at an interchange on a toll road, and the on-board unit that receives this entrance information "enters the toll road." By outputting a voice such as "Please be careful about reverse driving", you will be warned in advance not to run backward and alert you.<patcit num="1"><text>JP-A-2007-102443</text></patcit>

<p> However, in the technique described in Patent Document 1, entrance information is transmitted to all vehicles passing in the vicinity of the roadside radio device to give a warning to call attention, so that this warning is given to a driver who is trying to go forward. May be annoying. Therefore, for vehicles that are extremely likely to reverse the main line of the toll road, such as accidentally entering from the outflow ramp or running backwards on the approach road of SA / PA, or vehicles running backwards on the main line. If it is possible to give a warning to prevent reverse driving, it is possible to effectively prevent reverse driving without causing discomfort to the driver of the traveling vehicle.</p><p> An object of the present invention is to provide a road-to-vehicle communication system that warns against reverse-way driving to a vehicle that is running in reverse or a vehicle that is highly likely to run in reverse on a one-way road such as a toll road. And.</p>

<p> In order to achieve the above object, the invention according to claim 1 is The first roadside wireless device, which is installed on a one-way road and communicates in a narrow area with the on-board unit mounted on the vehicle, The second roadside wireless device, which is provided on the downstream side of the first roadside wireless device and communicates in a narrow range with the on-board unit mounted on the vehicle, The first roadside wireless device and the management device capable of communicating with the second roadside wireless device are provided. The first roadside wireless device and the second roadside wireless device are When a vehicle passes through each communicable range, the vehicle identification information for identifying the vehicle is acquired, and the vehicle identification information is acquired. The management device is The vehicle identification information acquired by the first roadside wireless device is stored in the storage unit, and the vehicle identification information is stored in the storage unit. It is determined whether or not the vehicle identification information acquired by the second roadside wireless device is included in the vehicle identification information stored in the storage unit. When the vehicle identification information acquired by the second roadside radio device is not included in the vehicle identification information stored in the storage unit, the reverse running warning information is given to the vehicle via the second roadside radio device. It is a road-to-vehicle communication system characterized by providing.</p><p> The invention according to claim 2 is the road-to-vehicle communication system according to claim 1. When the vehicle identification information acquired by the second roadside radio device is included in the vehicle identification information stored in the storage unit, the management device deletes the vehicle identification information from the storage unit. It is characterized by.</p><p> The invention according to claim 3 is the road-to-vehicle communication system according to claim 1 or 2. The first roadside radio device is installed at the entrance of the approach road that enters the parking area (SA / PA) from the main line of the toll road. The second roadside radio device is characterized in that it is installed at the exit of the approach road.</p><p> The invention according to claim 4 is the road-to-vehicle communication system according to claim 3. When the vehicle passes through the communicable range, the first roadside wireless device acquires vehicle type information for identifying the vehicle type of the vehicle, and obtains vehicle type information. The management device is The vehicle identification information and the vehicle type information acquired by the first roadside wireless device are stored, and the vehicle identification information and the vehicle type information are stored. Identify the vehicle type (large vehicle, medium / small vehicle, disabled vehicle, etc.) based on the vehicle type information, and When the vehicle identification information acquired by the second roadside wireless device is included in the vehicle identification information acquired from the first roadside wireless device, it is characterized by providing guidance guidance information corresponding to the vehicle. And.</p><p> The invention according to claim 5 is the road-to-vehicle communication system according to any one of claims 1 to 4, wherein the second roadside wireless device includes the management device. ..</p><p> The invention according to claim 6 is the road-to-vehicle communication system according to any one of claims 1 to 5, wherein the vehicle identification information or the vehicle type information is stored in an on-board unit mounted on the vehicle. It is characterized by that.</p>

<p> According to the roadside communication system according to the present invention, on a one-way road such as a toll road, a warning for preventing reverse-way driving is given to a vehicle running in reverse or a vehicle having an extremely high possibility of reverse-way driving. It is possible to effectively prevent a reverse-way accident on the road.</p>

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing an example of the installation status of the road-to-vehicle communication system according to the present invention.

As shown in FIG. 1, the road-to-vehicle communication system 100 according to the present embodiment is installed on the first road side at the entrance of the approach road Lin from the main line Lm to the service area or the parking area (hereinafter referred to as SA / PA). It is composed of a wireless device 1 and a second roadside wireless device 2 installed on the SA / PA side. Here, at two points with different one-way routes, the point where the vehicle passes first is the upstream side, and the point where the vehicle passes later is the downstream side. That is, in the approach road Lin, the second roadside radio device 2 is installed on the downstream side of the first roadside radio device 1. In the following description, when it is simply described as a roadside wireless device, it indicates that it is a roadside wireless device used in a general road-to-vehicle communication system (first roadside wireless device 1, second roadside wireless device 2). Also included).

On the main line Lm of the toll road, vehicles C, C, ... travel in one direction. When vehicle C traveling on the main line Lm enters a parking area such as SA / PA, it travels on the approach road Lin branching to the right from the main line Lm (vehicles Ca, Cb, Cc). Then, when the vehicle C returns from the SA / PA to the main line Lm, it usually travels on the advance road Lout that joins the main line Lm from the right side. On the other hand, when the vehicle Cd that travels on the approach road Lin and arrives at SA / PA tries to return to the main line Lm by traveling on the approach road Lin, this vehicle Cd runs backward on the approach road Lin, and on the main line. Is very likely to run backwards.

The road-to-vehicle communication system 100 of the present embodiment warns a vehicle (for example, vehicle Cd) that has an extremely high possibility of traveling in reverse on the approach road Lin and traveling in reverse on the main line Lm, and reverses on the toll road. Prevent driving accidents.

FIG. 2 is an explanatory diagram of the roadside area, which is the communicable range of the roadside wireless device. FIG. 2 shows the first roadside wireless device 1. As shown in FIG. 2, the first roadside radio device 1 radiates DSRC radio waves having a limited reach from an antenna 1a installed on the side of the road or above the road, and forms a roadside area Z1 in the vicinity of the roadside radio device. .. Here, DSRC is a narrow-range communication method using radio waves in the 5.8 GHz band, and its communication range is, for example, several meters to several tens of meters.

Generally, in a road-to-vehicle communication system, a plurality of roadside radio devices are installed, but since the outputs of DSRC radio waves from the roadside radio devices are all set to the same degree, the roadside areas formed by the plurality of roadside radio devices are different. It is almost constant regardless of the setting location. In the present embodiment, the first roadside radio device 1 and the second roadside radio device 2 form equivalent roadside areas Z1 and Z2 (see FIG. 1). Then, the first roadside radio device 1 and the second roadside radio device 2 are capable of two-way wireless communication (road-to-vehicle communication) only with the on-board unit 3 mounted on the vehicle C in the roadside areas Z1 and Z2, respectively. It becomes.

FIG. 3 is an explanatory diagram showing a configuration example of the road-to-vehicle communication system 100. That is, the first roadside wireless device 1 and the second roadside wireless device 2 include a processing device (for example, a computer terminal) composed of the functional blocks shown in FIG. As shown in FIG. 3, the road-to-vehicle communication system 100 is configured to include a first roadside radio device 1 and a second roadside radio device 2, each of which is based on an on-board unit 3 and DSRC mounted on the vehicle C. Perform road-to-vehicle communication.

The first roadside wireless device 1 includes a control unit 11, a DSRC communication unit 12, and a network communication unit 13. The control unit 11 includes a CPU 111, a ROM 112, and a RAM 113. The CPU 111 performs various operations by executing the control program stored in the ROM 112 with the RAM 113 as the work area, and also controls the DSRC communication unit 12 and the network communication unit 13.

The DSRC communication unit 12 transmits / receives information to / from the vehicle-mounted device 3 mounted on the vehicle C by DSRC. For example, the DSRC communication unit 12 requests the vehicle-mounted device 3 for vehicle type information for identifying a vehicle type (large vehicle, medium / small vehicle, vehicle driven by a handicapped person, etc.) and vehicle identification information for identifying the vehicle. Always transmit DSRC radio waves. Hereinafter, the vehicle type information and the vehicle identification information are collectively referred to as vehicle-related information. Then, when the vehicle C passes through the roadside area Z1 of the first roadside wireless device 1, in response to this request, the on-board unit 3 mounted on the vehicle C transmits information about the vehicle, and thus receives this information. ..

The network communication unit 13 transmits / receives information to / from the second roadside wireless device 2 via the network N. For example, when information about the vehicle is acquired from the vehicle-mounted device 3, this information is immediately transmitted to the second roadside radio device 2. Information about this vehicle is accumulated in the second roadside radio device 2, and the vehicle C that has passed the entrance of the approach road Lin normally passes through the exit and enters the SA / PA, or the vehicle that has entered the SA / PA. It will be used to monitor whether C is going backwards on the approach road Lin and entering the toll road.

The second roadside wireless device 2 includes a control unit 21, a DSRC communication unit 22, a network communication unit 23, and a provided information storage unit 24. It differs from the first roadside wireless device 1 in that it includes a provided information storage unit 24. The control unit 21 includes a CPU 211, a ROM 212, and a RAM 213. The CPU 211 performs various operations by executing the control program stored in the ROM 212 using the RAM 213 as a work area, and also controls the DSRC communication unit 22 and the network communication unit 23.

For example, the CPU 211 stores the information about the vehicle transmitted from the first roadside radio device 1 in the RAM 213 by executing the information providing processing program stored in the ROM 212, and stores the information stored in the RAM 213 and the information described later. By comparing with the information about the vehicle acquired by the DSRC communication unit 22, the vehicle C that has passed through the roadside area Z2 of the second roadside radio device 2 is identified, and predetermined information is provided. A detailed description of the information providing process will be described later.

In this way, the control unit 21 receives the information from the first roadside wireless device 1 and exchanges information in the second roadside wireless device 2, so that the first roadside wireless device 1 and the second roadside wireless device 2 exchange information. It can be said that it is configured to be able to communicate with 2. That is, the control unit 21 constitutes the management device according to the present invention. By making the second roadside radio device 2 also function as a management device, the time required for information communication is shortened, and when a reverse-way vehicle passes through the roadside area Z2 of the second roadside radio device 2, the reverse is instantly reversed. It is possible to provide running warning information.

The DSRC communication unit 22 transmits / receives information to / from the on-board unit 3 mounted on the vehicle C by DSRC. For example, the DSRC communication unit 22 constantly transmits a DSRC radio wave requesting information about the vehicle to the vehicle-mounted device 3. The second roadside wireless device 2 may request only the vehicle identification information as the information about the vehicle. Then, when the vehicle C passes through the roadside area Z2 of the second roadside wireless device 2, in response to this request, the on-board unit 3 mounted on the vehicle C transmits information about the vehicle, and thus receives this information. .. Further, the DSRC communication unit 22 transmits predetermined information to the vehicle C passing through the roadside area Z2 in the information providing process executed by the CPU 211.

The network communication unit 23 transmits / receives information to / from the first roadside wireless device 1 via the network N. For example, it receives information about the vehicle transmitted from the first roadside radio device 1.

The provided information storage unit 24 is composed of, for example, a non-volatile memory, and stores information to be provided to the vehicle C in the information providing process. For example, in SA / PA, guidance guidance information consisting of video information for visually guiding a large vehicle, a medium / small vehicle, a vehicle driven by a disabled person, etc. to each parking area is stored (guidance guidance 1, which will be described later). 2nd grade). In addition, it stores reverse-way warning information that visually notifies the vehicle running in reverse on the approach road Lin that it is running in reverse. The guidance guidance information is stored in association with the information about the vehicle when the vehicle C passes through the roadside area Z1 in the information providing process executed by the CPU 211, and is transmitted when the vehicle C passes through the roadside area Z2. Will be done. Further, the reverse-way driving warning information is transmitted to the vehicle C when the vehicle C traveling in the reverse direction in the roadside area Z2 is detected in the information providing process.

FIG. 4 is a block diagram showing a configuration example of the vehicle-mounted device 3 mounted on the vehicle C. The in-vehicle device 3 is an ITS in-vehicle device applicable to ITS (Intelligent Transport System). For example, in a conventional road-to-vehicle communication system, content information transmitted from a center device via a roadside wireless device is used. Etc. are received, saved or output.

Further, in the road-to-vehicle communication system 100 according to the present embodiment, the in-vehicle device 3 communicates with the first roadside radio device 1 and the second roadside radio device 2 by DSRC, and the first roadside radio device 1 and the second roadside radio device 3 communicate with each other by DSRC. While transmitting information about the vehicle to the device 2, it receives and outputs the provided information transmitted from the second roadside wireless device 2.

As shown in FIG. 4, the on-board unit 3 includes the control unit 31, the DSRC unit 32, and the VICS.<u style="single">(Registered trademark)</u>module<u style="single">(Hereafter, VICS module)</u>It is configured with 33 and a car navigation unit 34.

The control unit 31 includes a CPU 311, a ROM 312, and a RAM 313. The CPU311 performs various operations and centrally controls each part by executing the control program stored in the ROM312 using the RAM313 as a work area. For example, when communicating with the roadside radio device 1 or the roadside radio device 2 by DSRC, the communication operation of the DSRC unit 32 is controlled. In addition, in the control of the DSRC unit 32, the control is performed in cooperation with the DSRC control unit 321 of the DSRC unit 32.

Specifically, when the DSRC unit 32 receives a DSRC radio wave requesting information about the vehicle, which is constantly transmitted from the first roadside radio device 1 or the second roadside radio device 2, the DSRC unit 32 is controlled. , This information is transmitted to the first roadside radio device 1 or the second roadside radio device 2. Further, when the DSRC unit 32 receives the provided information transmitted from the second roadside wireless device 2, the car navigation unit 34 is controlled to output the provided information.

The DSRC unit 32 includes a DSRC control unit 321, a DSRC communication unit 322, a storage unit 323, an ETC processing unit 324, and an IC card interface 325, and processes for communicating with a roadside radio device or an ETC base station by DSRC. I do.

The DSRC control unit 321 is configured to include a CPU, ROM, and RAM (all not shown), and controls the operation of each unit of the DSRC unit 32 in cooperation with a control program stored in the ROM. For example, when making a payment by ETC (Electronic Toll Collection: automatic toll collection system), the communication operation of the DSRC communication unit 322 is controlled and the ETC base station (radio provided near the ETC gate to make ETC payment) is provided. Send and receive payment information with the base station). In addition, the ETC processing unit 324 is made to perform a process of writing payment information to an IC such as a credit card.

Further, for example, when the DSRC communication unit 322 receives the content information from the center device via the roadside wireless device, it is transmitted to the control unit 31. Further, when the DSRC communication unit 322 receives the provided information via the second roadside wireless device 2, it is transmitted to the control unit 31.

The DSRC communication unit 322 includes an antenna installed near the windshield on the dashboard of the vehicle C, and communicates with the roadside radio device and the ETC base station by DSRC via this antenna.

The storage unit 323 is composed of, for example, a non-volatile memory, and stores the vehicle-mounted device ID assigned to the vehicle-mounted device 3, vehicle information of the vehicle C on which the vehicle-mounted device 3 is mounted, and the like. The on-board unit ID is on-board unit information assigned to each on-board unit at the time of manufacturing. The vehicle information includes the license plate information of the vehicle C on which the on-board unit 3 is mounted and the vehicle type information (large vehicle, medium-sized vehicle, small vehicle, disabled driving vehicle, etc.), and is registered when the on-board unit 3 is mounted on the vehicle C. Be done (setup).

The above-mentioned vehicle-mounted device ID and / or vehicle information will be transmitted to the first roadside radio device 1 and the second roadside radio device 2 as information about the vehicle. In particular, the on-board unit ID or license plate information becomes the vehicle identification information for identifying the vehicle. Since the first roadside radio device 1 and the second roadside radio device 2 acquire the on-board unit ID or license plate information as vehicle identification information, the roadside areas Z1 and Z2 of the first roadside radio device 1 or the second roadside radio device 2 The vehicle C passing through can be accurately identified.

The ETC processing unit 324 reads and writes payment information and the like to a credit card or debit card with an IC inserted and removed from the IC card interface 325. The IC card interface is provided with a slot such as a credit card, and mediates the exchange of information between the IC such as a credit card inserted in this slot and the ETC processing unit.

The VICS module 33 is equipped with antennas for optical communication, FM communication, and 2.4GHz radio communication, respectively, and is a VICS (Vehicle Information and Communication System).<u style="single">(Registered trademark)</u>: Road traffic information communication system) Performs optical communication, FM communication, and radio communication with the center. The VICS module 33 receives congestion information, road traffic information, etc. from the VICS center and transmits them to the control unit 31.

The car navigation unit 34 includes a car navigation control unit 341, a current location detection unit 342, a map storage unit 343, an operation unit 344, an output unit 345, and a storage unit 346, and performs a process for guiding the vehicle C to a guide route. Do.

The car navigation control unit 341 extends from the current location of the vehicle C to the destination set via the operation unit 344 based on the current location information acquired from the current location detection unit 342 and the map information stored in the map storage unit 343. Calculate the guidance route. Then, using the map information stored in the map storage unit 343, a map screen for guiding to the calculated guide route is generated and displayed on the display of the output unit 345.

The current location detection unit 342 is equipped with a GPS (Global Positioning System), a gyro sensor, and the like. GPS receives GPS signals transmitted from GPS satellites and calculates the vehicle position (latitude, longitude) based on the GPS signals. The gyro sensor detects the acceleration of the vehicle (horizontal rotation speed per unit time) indicating the amount of change in the moving direction (angular velocity sensor), and also detects the geomagnetism (direction sensor), and the absolute orientation of the own vehicle. Is detected. The current location detection unit 342 generates current location information (information such as latitude and longitude) indicating the current location of the vehicle and travel speed information based on the information acquired from the GPS and the gyro sensor, and transmits the information to the car navigation control unit 341.

The map storage unit 343 is composed of a storage medium such as a hard disk or a DVD, and stores map information necessary for guidance display. The operation unit 344 is composed of a hard key provided on the main body of the vehicle-mounted device, a touch panel (soft key) integrally provided on the display of the output unit 345, or a remote controller. When a key operation is performed by the user, the operation unit 344 generates an operation signal corresponding to this operation and outputs it to the control unit 31.

The output unit 345 is composed of a display and a speaker. The display guides the screen display according to the control of the control unit 31. For example, a setting screen, a map screen, a display screen of content information received from the center device of the road-to-vehicle communication system, and the like are displayed. The speaker provides voice guidance according to the control of the control unit 31.

The storage unit 346 is composed of, for example, a readable and writable semiconductor memory. The storage unit 346 stores, for example, guide information (road information, traffic jam information, etc.) received via the VICS module 33, vehicle travel history, and the like.

FIG. 5 is a flowchart showing an example of the information providing process according to the present invention. In the present embodiment, the information providing process is realized by the CPU 211 executing the information providing processing program in the ROM 212 in the second roadside wireless device 2.

In step S101, it is determined whether or not information about the vehicle has been received from the first roadside radio device 1. For example, when the information about the vehicle is acquired from the vehicle C passing through the roadside area Z1 in the first roadside radio device 1, this information is transmitted to the second roadside radio device 2 and received by the second roadside radio device 2. It will be. Then, when it is determined that the information about the vehicle has been received from the first roadside wireless device 1, the process proceeds to step S102, and when it is determined that the information has not been received, the process proceeds to step S104.

In step S102, the information about the vehicle transmitted from the first roadside radio device 1 is stored in the RAM 213 as passing vehicle information. That is, the information about the vehicle C that has entered the approach road Lin from the main line Lm of the toll road is stored.

In step S103, when the passing vehicle information is newly stored in the RAM 213, the provided information is stored correspondingly, and the information to be provided to the vehicle C passing through the roadside area Z2 of the second roadside device 2 is prepared. To do. For example, when the vehicle type information included in the newly stored passing vehicle information is a "large vehicle", the information for guiding and guiding the parking area of the large vehicle is stored corresponding to the vehicle information.

FIG. 6 is an explanatory diagram showing an example of a data structure of passing vehicle information stored in the RAM 213. As shown in FIG. 1, FIG. 6 shows information on passing vehicles when vehicles Ca, Cb, and Cc enter the approach road Lin from the main line Lm. That is, for the passing vehicle Ca, the vehicle identification information "A", the vehicle type information "large size", and the provided information "guidance guidance 2" are stored correspondingly. Similarly, for the passing vehicle Cb, the vehicle identification information "B", the vehicle type information "medium size", and the provided information "guidance guidance 1" are stored correspondingly, and for the passing vehicle Cc, the vehicle identification information "C" and the vehicle type are stored. The information "small size" and the provided information "guidance guide 1" are stored correspondingly. Here, the guidance guide 1 and the guidance guidance 2 which are the provided information are the provided information stored in the provided information storage unit 24.

In FIG. 5, in step S104, it is determined whether or not the second roadside radio device 2 has received information about the vehicle (vehicle identification information) from the vehicle C passing through the roadside area Z2. Then, when it is determined that the information about the vehicle has been received from the vehicle C passing through the roadside area Z2, the process proceeds to step S105, and when it is determined that the information has not been received, the process ends as it is.

In step S105, the vehicle identification information stored in the RAM 213 as passing vehicle information is compared with the vehicle identification information acquired from the vehicle C passing through the roadside area Z2, and the vehicle C passing through the roadside area Z2 is compared with the roadside area. Determine if the vehicle has passed Z1. Then, when it is determined that the vehicle C has passed the roadside area Z1, that is, when it is determined that the vehicle is a vehicle traveling on the approach road Lin, the process proceeds to step S106. On the other hand, if it is determined that the vehicle has not passed the roadside area Z1, that is, if it is determined that the vehicle is traveling in the opposite direction on the approach road Lin, the process proceeds to step S108.

In step S106, the prepared provided information is transmitted to the vehicle-mounted device 3 of the vehicle. Specifically, the provided information corresponding to the vehicle is transmitted by referring to the provided information stored in the RAM 213 as the passing vehicle information.

For example, when the passing vehicle information as shown in FIG. 6 is stored in the RAM 213 and the vehicle Ca passes through the roadside area Z2, the guidance guide 2 for guiding the large vehicle is transmitted. Then, in the vehicle-mounted device 3 mounted on the vehicle Ca, the car navigation unit 34 outputs the output based on the guidance guide 2. For example, the display of the output unit 345 of the car navigation unit 34 displays a screen as shown in FIG. 7 (b). From this screen display, the driver can know that he / she can reach the parking area for large vehicles by moving to the right side.

Further, for example, when the passing vehicle information as shown in FIG. 6 is stored in the RAM 213 and the vehicle Cb passes through the roadside area Z2, the guidance guide 1 for guiding the medium-sized vehicle is transmitted. Then, in the vehicle-mounted device 3 mounted on the vehicle Cb, the car navigation unit 34 outputs the output based on the guidance guide 1. For example, the screen shown in FIG. 7A is displayed on the display of the output unit 345 of the car navigation unit 34. From this screen display, the driver can know that he / she can reach the parking area for small and medium-sized vehicles by going straight.

As described above, in the present embodiment, the second roadside radio device 2 stores the vehicle identification information and the vehicle type information acquired by the first roadside radio device 1, and based on the vehicle type information, the vehicle type (large vehicle) of the vehicle C is stored. , Small vehicles, vehicles driven by people with disabilities, etc.). Then, when the vehicle identification information acquired by the second roadside wireless device is included in the vehicle identification information acquired from the first roadside wireless device 1, the guidance guidance information corresponding to the vehicle C is provided. .. That is, the parking area of the vehicle C is guided and guided to the vehicle C that advances along the approach road Lin and enters the SA / PA. As a result, it is possible to prevent a driver who does not frequently use the SA / PA from wandering in search of a parking area and causing a collision accident or a traffic jam in the SA / PA.

In FIG. 5, in step S107, the information corresponding to the vehicle passing through the roadside area Z2 of the second roadside radio device 2 is deleted from the passing vehicle information stored in the RAM 213. As a result, when a vehicle that has normally entered the SA / PA runs backwards into the approach road Lin from within the SA / PA and enters, the vehicle can be determined as a reverse-way vehicle. Further, since it is sufficient that the RAM 213 can store the passing vehicle information of the number of vehicles that can be parked and stopped at the approach road Lin at the same time, the storage area can be efficiently used. For example, it is sufficient for the RAM 213 to secure a storage area that can store information on passing vehicles, which is about twice the number of vehicles that can be parked and stopped at the approach road Lin at the same time.

In step S108, the reverse driving warning information stored in the provided information storage unit 24 is transmitted to the vehicle-mounted device 3 of the vehicle C. As described above, when the vehicle C normally enters the SA / PA, the passing vehicle information corresponding to the vehicle C is deleted from the RAM 213. Regarding C, the passing vehicle information of the vehicle C is not stored in the RAM 213. Therefore, for such a vehicle (vehicle Cd in FIG. 1), reverse-way warning information for warning that the vehicle is running in reverse is provided.

For example, if the passing vehicle information as shown in FIG. 6 is stored in the RAM 213 and the vehicle Cd passes through the roadside area Z2, the passing vehicle information does not include the information related to the passing vehicle Cd. Send information. Then, in the vehicle-mounted device 3 mounted on the vehicle Cd, the car navigation unit 34 outputs the output based on the reverse driving warning information. For example, the screen shown in FIG. 8 is displayed on the display of the output unit 345 of the car navigation unit 34. From this screen display, the driver can know that the vehicle is running in reverse and will return to SA / PA before joining the main line Lm, so that a reverse-way accident will occur in the main line Lm. Can be prevented.

If there is a vehicle that is going to enter the SA / PA in the approach road Lin, the direction of travel of the vehicle can be easily recognized, so the SA / PA runs backwards on the approach road Lin to the main line. The event of merging is unlikely to occur. That is, when vehicle C is provided with the reverse driving warning information, it is considered that the approach road Lin is not congested, so that it is possible to make a U-turn and easily return to SA / PA.

As described above, the road-to-vehicle communication system 100 of the present embodiment is provided on the approach road (one-way road) Lin from the main line Lm of the toll road to the SA / PA, and is the vehicle-mounted device 3 mounted on the vehicle C. It includes a first roadside radio device 1 that communicates in a narrow area, and a second roadside radio device 2 that is provided on the downstream side of the first roadside radio device 1 and communicates with the on-board unit 3 mounted on the vehicle C in a narrow range. .. Then, the first roadside radio device 1 and the second roadside radio device 2 provide vehicle identification information (for identifying the vehicle C) when the vehicle C passes through the respective roadside areas (communicable range) Z1 and Z2. Obtain the in-vehicle device ID and license plate information).

On the other hand, the second roadside radio device 2 as a management device stores the vehicle identification information acquired by the first roadside radio device 1 in the RAM (storage unit) 213 as passing vehicle information (step S102 in FIG. 5). 2 It is determined whether or not the vehicle identification information acquired by the roadside radio device 2 is included in the vehicle identification information stored in the RAM 213 (step S105 in FIG. 5). Then, when the vehicle identification information acquired by the second roadside radio device 2 is not included in the vehicle identification information (passing vehicle information) stored in the RAM 213, the reverse driving warning information is provided to the vehicle C. ..

Therefore, according to the roadside communication system 100 according to the present embodiment, the vehicle C having an extremely high possibility of traveling in reverse on the main line Lm such as a toll road can be determined by the traveling mode of the approach road Lin, which is opposite to this vehicle C. Since it is possible to give a warning to prevent running, it is possible to effectively prevent a reverse-way accident. In addition, since a warning to prevent reverse driving is given only to vehicles that are extremely likely to run backwards on the main line Lm of the toll road, there is a risk of causing discomfort by giving a blind warning to the driver of a traveling vehicle. Nor. In particular, on the approach road Lin to SA / PA, vehicle C travels at a lower speed than when traveling on the main line, so it is considered that a reverse-way accident can be avoided if a reverse-way driving can be warned before merging with the main line Lm.

Although the invention made by the present inventor has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment and can be modified without departing from the gist thereof.

For example, the road-to-vehicle communication system according to the present invention can be applied not only on the approach road Lin from the main line Lm of the toll road to SA / PA but also on the advance road from the main line Lm of the toll road to the outflow ramp. In this case, the first roadside radio device is provided on the entrance side (main line side) upstream of the advance path, and the second roadside radio device is provided on the exit side (near the outflow lamp) downstream. The road-to-vehicle communication system of the present invention can also be applied to the main line Lm of a toll road. As a result, it is possible to give a reverse-way warning to the vehicle C that is actually running in reverse on the main line Lm. It is unlikely that you can avoid a reverse-way accident because it does not prevent you from running backwards on the main line Lm by issuing a reverse-way warning near the approach road Lin entering SA / PA from the main line Lm or near the outflow ramp. However, it is useful to warn that a vehicle that actually runs in reverse on the main line Lm is extremely dangerous.

In the above embodiment, the second roadside wireless device 2 includes a management device, but as shown in FIG. 9, a center device 4 as a management device is separately provided on the network N, and the center device 4 and the first roadside are provided. The wireless device 1 and the second roadside wireless device 1 may be capable of communicating with each other. In this case, the center device executes a process corresponding to the information providing process shown in FIG.

Further, the vehicle-mounted device 3 may not only output the video to the display of the output unit 345 of the car navigation unit 34 but also output the voice from the speaker based on the guidance guidance information or the reverse driving warning information. Guidance guidance information and reverse-way driving warning information can be easily realized by configuring them to include voice information.

In the above embodiment, the first roadside radio device 1 and the second roadside radio device 2 acquire the vehicle-mounted device ID or vehicle information (including license plate information and vehicle model information) stored in the vehicle-mounted device 3 as information about the vehicle. However, vehicle identification information or vehicle type information may be acquired by other means. For example, various sensors and imaging devices can be used to identify the vehicle or identify the vehicle type based on the information acquired from these.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

<figref num="1">It is the schematic which shows an example of the installation situation of the road-to-vehicle communication system which concerns on this invention.</figref><figref num="2">It is explanatory drawing of the roadside area which is the communication range of the roadside wireless device.</figref><figref num="3">It is explanatory drawing which shows one configuration example of the road-to-vehicle communication system.</figref><figref num="4">It is a block diagram which shows one configuration example of an in-vehicle device mounted on a vehicle.</figref><figref num="5">It is a flowchart which shows an example of the information provision processing which concerns on this invention.</figref><figref num="6">It is explanatory drawing which shows an example of the data structure of the passing vehicle information stored in RAM.</figref><figref num="7">It is explanatory drawing which shows the display example of the guidance guidance output on the display of a car navigation part.</figref><figref num="8">It is explanatory drawing which shows the display example of the reverse driving warning output on the display of a car navigation part.</figref><figref num="9">It is the schematic which shows the other configuration example of the road-to-vehicle communication system.</figref>

Code description

1 1st roadside device 11 Control unit 111 CPU 112 ROM 113 RAM 12 DSRC Communication Department 13 Network Communication Department 2 2nd roadside device 21 Control unit (management device) 211 CPU 212 ROM 213 RAM (storage) 22 DSRC Communication Department 23 Network Communication Department 24 Provided information storage 3 On-board unit 100 road-to-vehicle communication system