JPS5835312B2 - road traffic control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to improvements in road traffic control devices.

One method for accurately controlling traffic flow on wide-area road networks is a route guidance system that communicates between the ground and vehicles and guides vehicles along the optimal route to their destination. .

This is something like the following.

A plurality of major points are determined in advance within the road network within the control target range.

Each of these points is assigned a unique point code.

Roadside processing equipment is installed at each location, all of which can exchange data with solid equipment at the control center.

On the other hand, a vehicle to be controlled is equipped with an on-vehicle device that can communicate with the road processing device.

When such a vehicle passes a certain point, the on-vehicle device transmits the point code of the vehicle's destination to the roadside processing device, and in response, the onboard device sends the point code of the destination of the vehicle from the roadside processing device to the destination ( Generally, it receives route guidance information along the shortest time route).

This route guidance information is, for example, a route instruction such as whether to go straight through the intersection at the relevant point, or whether to turn left or right.

Since such route instructions are given each time the vehicle passes through each point, if the driver drives the vehicle in accordance with the instructions, the vehicle can travel along the route in the shortest time to the destination.

In such a route guidance system, the shortest time route is determined as follows.

First, the intermediate fire device collects the travel time (hereinafter referred to as travel time) for each of all road sections (between two predetermined major points) in the road network.

For this purpose, for example, the travel time measurement method already proposed by the applicant (Japanese Patent Application No. 42573/1983) can be used.

Additionally, the solid device utilizes the collected travel times to determine each shortest time path from one point to every other point -\.

For this purpose, for example, a device for calculating the shortest time route, which the applicant has already proposed (Japanese Patent Application No. 53-277
72) can be used.

As a result, for example, considering a road network with n points, a total of (n-1) shortest time routes are determined.

Such shortest time routes are determined for all points within the road network.

Therefore, in the case of the above example, the shortest time path of nX(n-1) is determined.

Note that the traffic conditions within the road network change from moment to moment, and the travel time for each road section changes accordingly.

Therefore, the shortest route from one point to another point is not always the same.

Therefore, the shortest route information is also updated, for example, every 15 minutes, 30 minutes, or 60 minutes, depending on newly collected travel times.

The information on the shortest route from a certain point to all other points thus determined is sent from the solid equipment to the on-road processing device at the certain point and stored in its memory.

In this way, the reason for pre-calculating the shortest route as mentioned above for all points and having it in the road processing device at the corresponding point is that the on-vehicle device and the road processing device when the vehicle passes the point This is because the time during which communication with the device is possible is relatively short, and route information can be given to the vehicle during that short time.

Now, when a vehicle approaches a certain point and gives the point code of that destination to the road processing device, the road processing device uses that destination point code as an index to search its own memory and travel from that point to the destination. The shortest time path can be found.

By knowing this shortest route, it is possible to instruct the vehicle on the course it should take at the intersection at that point.

As is clear from the above, in the above system, the shortest time route for all combinations with a certain point in the road network as the starting point and another point as the destination is determined using a solid device. Therefore, as the scale of the road network increases, the time required to calculate the shortest route increases.
The drawback is that most of the operating time of the solid equipment is consumed by this operation, making it difficult to control the system in response to changes in traffic conditions.

An object of the present invention is to provide a road traffic control device that enables control that quickly responds to changes in traffic conditions without the aid of solid devices.

A feature of the present invention is that a plurality of points are predetermined within a road network, a road treatment device is installed at each point, and a road treatment device is provided to a vehicle traveling within the road network.
In conveying traffic conditions such as traffic regulations and occurrence of traffic jams, each of the road processing devices detects the traffic conditions of all road sections that enter the point where the road processing device is installed, and uses the detection results to The traffic situation data created based on this information is sent to other road processing devices,
The purpose of the present invention is to create traffic condition display information to be transmitted to the vehicle at the point based on traffic condition data sent from a road processing device located within a predetermined range from the point.

This will be explained below with reference to the drawings.

FIG. 1 partially shows the overall configuration of a control device according to an embodiment of the present invention.

In other words, a plurality of points are set in advance on the road network within the control range, each with a unique point code. Only the portion containing A, B, and C is shown.

In the figure, 1 indicates a vehicle, which is assumed to be traveling in the direction of the illustrated arrow.

The vehicle 1 is equipped with an on-vehicle device that will be described later.

2a, 2b, and 2c indicate roadside treatment devices installed at points A, B, and C, respectively (in the following, when referring to roadside treatment devices in general, only the reference number 2 will be used).

Reference numeral 3 indicates a data line, which connects all the road processing devices 2 in the road network in the form of a network.

This allows data to be exchanged between the on-road processing devices.

4 indicates a road antenna, which is connected to the road processing device 2;
It is used for communication between the road processing device 2 and the on-vehicle device of the vehicle 1.

As shown for point B, the roadside antenna 4 is provided on the entrance side of all the approaches to the point, and a predetermined distance ahead of the point.

At point B, four roadside antennas 4, 4', 4", 4"
' are provided on the entrance side of each approach road, and all of them are connected to the road treatment device 2b.

However, in the figure, the connection line is shown only for one roadside antenna 4, but the same applies to the other antennas.

Further, although the same configuration is adopted at points A and C, only one roadside antenna 4 is representatively shown at each point in the figure.

5 indicates an information display board.

This display board 5 is also installed on the entrance side of all approach roads at each point, receives data from the road processing device 2 at the point, displays the traffic situation, and helps drivers decide on a course at the point.

In the figure, the display board 5 is shown only at point A, but it is also provided at other points B and C.

Note that, as will be clear from the explanation below, in the case of a vehicle 1 having an on-vehicle device, the on-vehicle device is usually provided with a display means having a similar function, so it is not always necessary to display a display board for each point. do not need.

However, by providing the display board 5, it is possible to notify the traffic situation even to vehicles that are not equipped with the above-mentioned on-vehicle device.

In the following description, "displaying the traffic situation at the relevant point" refers to both the case of displaying on the display board 5 and the case of displaying on the display device of the vehicle-mounted device.

Reference numeral 6 indicates a solid device installed in the control center, which is connected to all the road treatment devices 2 via data lines (not shown).

However, in this invention, since the solid device 6 does not have an essential role, detailed explanation of its configuration and functions will be omitted.

In the description that follows, only parts related to the invention will be described as necessary.

FIG. 2 shows an example of the configuration of the road treatment device 2. As shown in FIG.

In the figure, 4 is the roadside antenna shown in FIG. 1, 7 is a receiver, and 8 is a transmitter.

A vehicle detection circuit 9 detects that the vehicle 1 has reached the road antenna 4 based on the signal received by the receiver 7, and issues a vehicle detection signal.

Reference numeral 10 denotes a trigger signal generation circuit that generates a trigger signal when the vehicle detection signal is received.

As is clear from the explanation below, this trigger signal is
The signal is transmitted by the transmitter 8 via the roadside antenna 4 to the vehicle 1 passing there, and triggers various functions of the in-vehicle device.

11 is a point code register that stores the point code assigned to the point; 12 is the point code that is transmitted from the on-vehicle device, and is sent to the receiver 7;
A point code buffer memory stores the point code included in the signal received by the receiver 5, and a counter data buffer memory 13 stores the contents of a counter (details will be described later) in the on-vehicle device that is also included in the signal received by the receiver 5. .

The contents of the signals transmitted from the vehicle-mounted device will be described in detail in the description of the vehicle-mounted device with reference to FIG. 3.

14 determines, from the contents of the buffer memory 13, whether or not traffic congestion is occurring in the road section entering the point in question, or, if necessary, determining the extent of the congestion if it is occurring. This is a traffic jam determination circuit.

In this embodiment, only the presence or absence of traffic congestion is determined.

Reference numeral 15 denotes a push button switch for reporting the occurrence of an accident, which is provided at an appropriate location on the road and is operated by a person who witnessed the occurrence of an accident to report the occurrence of an accident.

Reference numeral 16 indicates an accident detection circuit that detects the occurrence of an accident when the switch 15 is turned on.

17 formats data from the register 11, buffer memory 12, traffic jam determination circuit 14, accident detection circuit 16, and, if necessary, the solid device 6 into a predetermined format, and transmits it to other road processing devices 2. This is a transmission data creation circuit that forms data for the transmission.

This data format will be explained later with reference to FIG.

18 is a transmission buffer memory, 19 is another road processing device 2
20 is a modem for exchanging data with the solid device 6, and 21 is a receiving buffer memory.

Reference numeral 22 denotes a data determination circuit, which determines whether the received data stored in the buffer memory 21 is data that should be taken in to create display information at the location.

Reference numeral 23 indicates a traffic situation data buffer memory that stores data determined by the data determination circuit 20 to be data to be captured.

Regarding the structure of the data judgment circuit 22 and the traffic situation data buffer memory 23, please refer to FIG. 5 later.
I will explain in more detail.

24 is a fixed pattern memory for storing fixed information on the display screen of the display board 5 or the display device of the in-vehicle device described later, for example, information such as the road shape of the point in question; A display information creation circuit that creates display contents on the display board 5 or the display device of the in-vehicle device based on data; 26 is a timer;
7 indicates an output sofa memory.

Next, the on-vehicle device will be explained with reference to FIG.

In the figure, 28 is an on-board antenna, 29 is a receiver, and 30
is the transmitter.

31 indicates a trigger signal detection circuit, which is connected to the road processing device 2.
The trigger signal included in the signal transmitted from the vehicle and received by the receiver 29 via the on-board antenna 28 is detected, and if the trigger signal is detected, a detection signal is emitted.

Reference numeral 32 indicates a clock pulse generation circuit, and 33 indicates a counter. When this counter 33 receives the detection signal, it transfers the contents up to that point to the transmitter 30 and clears them to zero, and also outputs the data from the clock pulse generation circuit 32 again. Start counting clock pulses.

34 is a point code register that stores the point code included in the signal transmitted from the road processing device 2 and received by the receiver 29.

When this register 34 also receives a detection signal from the trigger detection circuit 31, it transfers the contents stored up to that point to the transmitter 30, and updates the contents with the newly received point code.

Reference numeral 35 denotes a display device that displays the display information received from the road treatment device 2 by the receiver 29.

Note that the counter 33 and the point code register 34
When the detection signal from the trigger detection circuit 31 is given to the transmitter 2B, the contents transferred from the on-board antenna 2B
The information is transmitted to the on-road treatment device 2 via.

Next, the operation of the above-mentioned configuration will be described. Prior to a detailed explanation of the operation, the functions of the road processing device 2 and the vehicle-mounted device will be explained.

First, the road treatment device 2 is connected to other road treatment devices 2 and further,
In addition to a communication function for exchanging data with the solid device 6 and the like and communicating with an on-vehicle device, if necessary, it has the following two functions.

One is a function of determining the traffic situation and creating data for data exchange with the other road processing device 2 based on the judgment, and the other is a function of determining the traffic situation and creating data for data exchange with the other road processing device 2. This is a function that creates traffic situation display information at a particular point based on data.

The former function cooperates with the function of the in-vehicle device, which will be described later, to calculate the time (
The system measures travel time (hereinafter referred to as travel time), detects the occurrence of traffic congestion based on that value, and creates traffic situation data.

For example, in FIG. 1, the road processing device 2a measures the travel time required for the vehicle 1 to travel from point B to point A, and detects the occurrence of traffic congestion in the road section between points B and A based on the measured travel time. do.

Traffic situation data created based on this is transmitted to the road processing device 2b.

The road processing device 2b uses the latter function described above to determine whether the received data should be used for display at its own location.

If it is determined that the data should be used, create information for display at point B based on that data and display it on the display board 5 (point B is not shown), or Or by transmitting to the vehicle, point B
The traffic situation in the direction of point A is notified to vehicles arriving after that.

In addition to the communication function for communicating with the road processing device 2, the on-vehicle device has a function of measuring travel time and displaying display information from the road processing device 2 in cooperation with the function of the road processing device 2. It has a function.

Next, a detailed explanation of the operation will be given.

First, regarding the measurement of travel time, which is the basis for creating traffic situation data, a case where the vehicle 1 travels from point B to point A will be described as an example.

When the vehicle 1 travels from the front in FIG. 1 and reaches point B, the ground handling equipment 2. b detects the arrival of the vehicle 1 by its vehicle detection circuit 9.

This vehicle detection can be realized, for example, by having the transmitter 30 of the on-vehicle device constantly transmit a signal of a specific frequency while the vehicle 1 is running, and having the receiver 7 receive the signal.

The vehicle detection signal drives the trigger signal generation circuit 10 and the point code register 11, and the trigger signal and the point code of point B are transmitted from the transmitter 8 to the vehicle 1 via the road antenna 4.
send it to.

These transmission signals are received by the receiver 29 of the on-vehicle device via the on-vehicle antenna 28.

When a trigger signal is detected by the trigger signal detection circuit 31 from the received signal, the counter 3
3 transfers the results counted so far to the transmitter 30, clears the contents, and starts counting clock pulses anew.

Similarly, the register 34 also transfers the contents held so far to the transmitter 30 and receives a new signal, that is, the point code of point B.

The counter 33 continues counting clock pulses while the vehicle 1 continues traveling toward point A.

When the vehicle 1 reaches the point A, the same operation as described above is performed between the on-vehicle device and the road treatment device 2a.

That is, the transmitter 30 of the counting result in the counter 33
In addition, in the register 34, the code of point B that has been held until then is transferred to the transmitter 30, and the contents are rewritten with the code of point A.

The data transferred by the transmitter 30 is transmitted via the on-vehicle antenna 28.

This is connected to the road treatment device 2 at point A via the road antenna 4.
is received by receiver 7 of a.

Of the received data, the code for point B is stored in the point code buffer memory 2, and the count result of the counter 33 is stored in the counter data buffer memory 3.

The contents of this buffer memory 13 are the clock pulses counted by the counter 33 of the on-vehicle device at fixed time intervals while the vehicle 1 was traveling between points B and A, so the content is the amount of time required for the vehicle 1 to travel the relevant section. It is proportional to the travel time.

The traffic jam determination circuit 14 reads the contents of the buffer memory 3 and detects the presence or absence of traffic congestion between points B and A.

That is, when the travel time value stored in the buffer memory 13 exceeds a standard value predetermined for between points B and A, it is determined that a traffic jam has occurred.

As mentioned earlier, in this embodiment, the determination circuit 1
4 only detects the presence or absence of traffic congestion, so
The output is a two-level signal, for example, code "1" when a traffic jam occurs and code "0" when normal.

It will be easily understood that if it is desired to judge the degree of traffic congestion here, several levels may be prepared as the standard values.

As described above, Shibusu is the basis of traffic situation data.

The presence or absence of a traffic jam is determined, but the travel time value for determining the occurrence of a traffic jam is completely dependent on the driving state of the vehicle 1 between points B and A.

For example, there may be cases in which the driver repeats several stops between points B and A, such as for passengers to get on and off, or for loading and unloading cargo, or for reasons other than stops due to restrictions due to traffic conditions.

In such a case, if clock pulses are continued to be counted during the stop time, the counting result of the counter 33 when reaching point A will show a value (abnormal data) that is greater than the actual travel time between points B and A. This will result in

Therefore, it is desirable to prevent the counting of clock pulses during stop times as described above.

For this purpose, it is considered that the clock pulse from the clock pulse generation circuit 32 is applied to the counter 33 via a gate, and this gate is opened by a signal that is generated only when the door of the vehicle is closed. It will be done.

Alternatively, in the case of a taxi, when the taxi is carrying passengers, that is, during the rental period, it is thought that the driver will not stop unnecessarily for his own convenience, so the signal obtained from the taxi meter may be used to Can be used as a signal.

These can prevent the occurrence of abnormal data.

Further, the determination circuit 14 is provided with a function of taking an average value, and after measuring the travel time as described above for each of a plurality of vehicles traveling between points B and A within a predetermined time interval, those values are calculated. Instead of using the values individually, it is also possible to calculate the average value of all the values and use it as the average travel time as an index of the road congestion situation in the measurement time period for the relevant section.

Conventional means of the same type could be used for the averaging function.

By doing so, it is also possible to reduce the influence of abnormal data based on the unique driving conditions of each vehicle.

The output of the traffic congestion determination circuit 14 is led to the transmission data creation circuit 17.

The transmission data creation circuit 17 is further supplied with signals from the point code register 11, point code buffer memory 12, accident detection circuit 16, reception buffer memory 21, and the like.

The transmission data creation circuit 17 generates the fourth data based on the given signal.
Create transmission data in the format shown in the figure.

As shown in the figure, this transmission data consists of a start point code section, an end point code section, a traffic situation section, and a counter section.

The point code given from the point code buffer memory 12 is written into the start point code section, and the point code given from the point code register 11 is written into the end point code section.

That is, the starting point code section contains the point code of the point that the vehicle that has just reached the point passed through immediately before.

In the example shown in FIG. 1, when the vehicle 1 reaches point A, the code for point B is written into the starting point code section.

Further, the code of the point in question, in the case of the above example, the code of point A is written in the end point code section.

Therefore, the code written in the two code sections is
This indicates one of the road sections on the approach road to the point.

Normally, the output from the traffic congestion determination circuit 14 will be written in the traffic situation section of the transmission data.

However, if an accident has occurred in the approach road section, the data of the traffic situation section is replaced by the output from the accident detection circuit 16, for example code "3".

Further, if the road section is subject to traffic restrictions due to events such as demonstrations or pedestrian malls, data indicating this, for example code "4", is transmitted from the solid device 6.

This data is received by modem 20 and stored in buffer memory 21.

In such a case, the data read from the buffer memory 21 will be written into the traffic situation section.

The function of the transmission data counter section will be made clear in the explanation below, but its contents are set to zero when the transmission data is created by the creation circuit 17 and transmitted from the road processing device.

The transmission data as described above is temporarily stored in the transmission buffer memory 18, and is transmitted by the modem 19 to other road processing equipment 2 through the data line 3.

Further, if necessary, the data is sent to the solid device 6 by the modem 20 and used for monitoring traffic conditions throughout the road network at the control center.

The above describes the former of the two functions of the road processing device 2 described above, that is, determining the traffic situation of the approach road section to the point in question, and creating data to be transmitted to the narrow road processing device 2 based on the result. This is a function to

Note that in the above, the traffic situation data is created based on travel time measured using a traveling vehicle.

However, the creation of the traffic situation data is not limited to this, and it goes without saying that it can be created based on indicators that are determined by other means and are dependent on the traffic situation.

For example, installing means capable of detecting a signal queue for passing through a certain point within a road section entering a certain point;
Thereby, it is possible to determine whether or not a traffic jam has occurred in the road section, and use the determination result as data to be written in the traffic situation section.

Further, by installing a plurality of detectors as described above, it is possible to detect the length of the queue, that is, the degree of traffic congestion.

Next, another function, that is, a function of creating display information based on received data, will be explained.

Data as shown in FIG. 4 sent from another road processing device 2 is received by the modem 19 and temporarily stored in the reception buffer memory 21.

The data stored in the buffer memory 21 is further led to a data determination circuit 22.

This data determination circuit 22 determines whether the given data should be used for creating display information at the point in question and further transmitted to the next road treatment device 2.

Here, the details of the data determination circuit 22 will be explained with reference to FIG. 5, taking as an example the case where the transmission data created by the road processing device 2a in FIG. 1 is received by the road processing device 2b. FIG. 5 also includes a part of the traffic situation data buffer memory 23).

As explained in the transmission data creation function to other road processing devices 2 mentioned above, the transmission data created using the actually measured travel time of the vehicle 1 traveling from point B to point A is If the traffic conditions between , A are normal, the situation will be as shown in Figure 6.

In other words, the start point code section contains a code "b" indicating point B.
, a code "a" indicating point A is written in the end point code section, a code "0" indicating a normal time in the traffic situation section, and an O in the counter section.

Now, in FIG. 5, numeral 36 indicates an adder, which adds l to the counter section of each data sent from the reception buffer memory 21.

Therefore, O in the counter part (rightmost end) of the data shown in the sixth figure becomes 1, and the whole becomes like rbaoIJ.

The above data is led to a determination circuit 37, which determines whether the content of the counter section of the data exceeds a predetermined value N, and only when the content is less than or equal to N, an adder 36
Allows data from to pass through.

If the content exceeds N, the data is discarded without being passed.

An appropriate natural number is selected as the predetermined value N.

For example, assume that the road treatment device at a certain point is set to N-3.

On the other hand, the content of the counter section of the transmission data is determined by the road processing device 2 at the fourth point from the point where the transmission data was created.
When it passes through, it becomes 4, which exceeds the predetermined value N (=3).

Therefore, if the certain point corresponds to the fifth point from the point where the transmission data was created, when the transmission data reaches the road treatment device 2 at that point,
It will be discarded.

As is clear from the above, the predetermined value N is arbitrarily determined depending on the range of traffic conditions to be displayed at the point.

The data that has passed through the determination circuit 37 is sent to the transmission buffer memory 18 for further transmission to other on-road processing devices 2, and is also provided to the comparison circuits 381, 38, .

These comparison circuits 38. . 382, one more thing
As two inputs, the corresponding road section memo'J
39. , 39□, ... are given.

Road section memo 1J39. ．． 392. . . . is provided corresponding to the road section leading to the point in question.

Therefore, the number of these memories depends on the shape of the road at the point, for example, four if the shape of the point is a crossroads,
If there is a three-way intersection, three memories are provided.

In the figure, only two are representatively shown.

In addition, each road section connected to each point is marked with l, II,
Branch numbers such as III and IV are given.

The memory 39. ．． 392 are road sections 1 and 392, respectively. I[
It is assumed that it corresponds to

Further, the above branch numbers are branch number registers 400, 402. ...
It is stored in...

Said road section memo 1J39. ．． 39□,... is divided into multiple sections, and each section has two areas m
It is divided into jn.

Each of the plurality of divisions in each memory stores a road section that can be reached from the point through the road section of the corresponding branch number and that is within the range for which the traffic situation is to be displayed at the point (judgment circuit 37 (determined by the predetermined value N set to )
is stored according to the codes of its starting and ending points.

That is, area m in each division stores the code of the starting point of the corresponding road section (starting point code), and area n stores the code of the ending point (end point code). (See first section of memory 392)
.

In the comparison circuits 3B, 38□, .
Road section memo') 391t 392t...
Both the start point and end point codes of the road section stored in each section are compared.

Then, the comparison circuits 383, 382, . . ., which detect that both codes match, send the data to the OR gates 411, 412.

As mentioned above, the data rbaoIJ is sent to the determination circuit 37.
If the data is sent from the comparator circuit 38□, the data will be output from the comparator circuit 38□.

In this way, the comparison circuits 381, 3B.

, . . . are stored in the corresponding branch number register 40 . , 40□, . . . with branch numbers from orgates 411, 412.・・・・・・
This is the output of the data determination circuit 22.

This output data is stored in the traffic situation data buffer memory 23.

Similarly to the data determination circuit 22, the traffic situation data buffer memory 23 also stores a plurality of memos 1J231゜23□, .
...has...

Each memo 1J23. , 232 has several sections for storing data from the data decision circuit 22.

Furthermore, each section consists of an area 1 starting point for storing a branch number, an area qtr for storing an end point code, an area S for storing traffic situation data, and an area t for storing the contents of the counter section.

Therefore, the data rba01J output from the comparison circuit 382 is stored in the buffer memory 2 along with the branch number "■".
The information is stored as shown in the first section of No. 32.

The display information creation circuit 25 stores the buffer memories 231, 232 . . . . and data stored in the fixed pattern memory 24 about the name of the point, road shape, etc. to create display information at the point.

The method of creating display information is as follows.

For example, the data stored in the buffer memory 23□ is the traffic situation for the direction that can be reached through the road section with branch number ■ at point B shown in Figure 1 (i.e., the road section between points B and A). However, these data are based on traffic conditions for left turns for vehicles entering point B from the road section with branch number I, and traffic conditions for vehicles entering point B from the road section with branch number ■.
For vehicles introduced at point B, the traffic situation for the right-turn direction is shown, and for vehicles entering point B from the road section with branch number ■, the traffic situation for the straight direction is shown.

The same thing applies to other buffer memo 1J23. .

The same can be said for 233 and 234 (although 233 and 234 are not shown, they correspond to branch numbers 1 and IV, respectively), but for vehicles entering point B from the road section of each branch number. The relationship between buffer memories that store traffic conditions for each direction of travel is shown in the table below.

In addition, each buffer memory 23. , 232.・・・・・・
Area S stores the traffic conditions for several road sections in front that can be reached through the road section of the corresponding branch number. The one having the largest code stored in the area t and the smallest content in the area t for storing the contents of the counter section is selected preferentially and used for creating display information.

The display information created in this way is temporarily stored in the output buffer memory 25.

The display information stored in the output buffer memory 25 is
Sequentially, the transmitter 8 transmits the signal to the vehicle 1 via the roadside antenna 4.
or as soon as the information is sent to the display board 5 of the point.
sent to.

The display information may be sent to the vehicle or the display board 5 each time the display information creation circuit 25 creates new information, but in order to avoid driver upset due to frequent changes in display information, the timer 26 Due to the effect of

An example of the display on the display device 35 and the display board 5 is shown in FIG.

In the figure, 42 to 48 are parts that display the road shape at the point, and normally all parts are the part 4 shown by the dotted line.
2° 44.46, 4B, and the solid line is made invisible based on the information about the road shape at the point, which is the content of the fixed pattern memory 24 given by communication with the road processing device 2 at each point. Part 43 indicated by
, 45, 47, and are displayed in a visible state.

Reference numeral 49 indicates an approach road to the point, which may be displayed in a fixed manner.

Furthermore, 50 to 56 are parts for displaying point names,
Normally all parts are indicated by dotted lines 50, 52, 5
4 and 56, the parts corresponding to the visually displayed road shape display parts 43, 45, and 47 are shown by solid lines, as shown in parts 51, 53, and 55.
It will be visible and the location name will be displayed.

The location names displayed here are for each buffer memory 23, .
232. It is obtained by decoding the point code stored in the area r for storing the end point code among the data selected by the data display information creation circuit 25 stored in .

Further, 57 is a part that displays the name of the point in question, and this part displays information from the fixed pattern memory 24.

Reference numerals 57 to 63 are sections for displaying traffic conditions, and like the above two display sections, normally all sections are as shown by the dotted lines 57, 59, 61, 63.
Portions corresponding to the road shape display portions 43, 45° 47 which have been rendered invisible and are visually displayed are visibly displayed, such as portions 58°, 60, 62 indicated by solid lines.

This display is as shown in the legend at the bottom of the illustrated display screen example.
For example, it is displayed by differences in color and brightness.

This display information is displayed in each buffer memory 231, 232, .
Display information creation circuit 2 from data stored in...
This data is obtained by decoding the code of the traffic situation data stored in area S among the data selected in step 5.

In addition, in the case of the display board 5 provided at each location,
Of course, among the above-mentioned display parts, the part displaying the road shape may not be variable and may fixedly show the road shape specific to the point.

As described above, according to the present invention, the traffic situation of each road section is detected by the road processing device at a point set within the road network.

Further, each road processing device collects the detected traffic situation data within a certain range by data exchange between the road processing devices.

Therefore, it is possible to quickly provide the driver with an appropriate range of traffic conditions.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the overall configuration of this invention, and FIG.
The figure shows an example of the configuration of the on-road processing device used in the above overall configuration, FIG. 3 shows an example of the configuration of the on-vehicle device installed in a vehicle, and FIG. A diagram to explain the format, Figure 5 is the second
6 is a diagram showing an example of data exchanged between road processing devices, and FIG. It is a figure which shows the example of a display of a situation. 2a, 2b, 2c...road treatment equipment, 3...
...Data line, 4...Road antenna, 5.
...Display board, 6...Solid device, 7...
...Receiver, 8...Transmitter, 9...
Vehicle detection circuit, 10...Trigger signal generation circuit,
11...Point code register, 12...
- Point code buffer memory, 13...Counter data buffer memory, 14...Congestion judgment circuit, 15...Push button switch for accident report, 16... - Accident detection circuit, 1T... Transmission data creation circuit, 18... Transmission buffer memory, 19, 20... Modem, 21...
Reception buffer memory, 22... Data determination circuit, 23... Traffic situation data buffer memory, 2
4...Fixed pattern memory, 25...
Display information creation circuit, 26...Timer, 27...
... Output buffer memory, 28 ... Vehicle antenna, 29 ... Receiver, 30 ... Transmitter, 31 ... Trigger signal detection circuit , 32...
... Clock pulse generation circuit, 33 ... Counter, 34 ... Point code register, 35.
... Display device, 36 ... Adder, 37.
. . . Judgment circuit, 383, 382 . . . Comparison circuit, 39. ．． 392 --- Road section memory, 4
01,402...Branch number register.

Claims (1)

[Claims] 1. A plurality of points are determined in advance within a road network, and a roadside processing device is installed at each point, and the roadside processing device informs vehicles traveling within the road network of traffic conditions such as the occurrence of traffic restrictions and congestion. Each of the road processing devices detects the traffic conditions of all road sections that enter the point where the road processing device is installed, and transmits traffic situation data created based on the detection results to other road processing devices. traffic condition display information to be transmitted to the vehicle at the point based on the traffic condition data sent from the road processing device within a predetermined range from the point. A road traffic control device characterized by: