JP2011034257A - Method and apparatus for identifying dangerous road, computer program for identifying dangerous road, and recording medium storing the computer program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for specifying a road that requires particular attention in roads to an intersection with traffic regulation information, and automatically creating road information about the road. <P>SOLUTION: The dangerous road specification method includes: extracting the road to the intersection with the traffic regulation information; extracting an exit road where entry from the road is prohibited, based on the traffic regulation information on the intersection; processing probe information to extract history of travel of a probe car having moved to the prohibited road from the road; and identifying the road as a dangerous road when the travel history is extracted. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and apparatus for identifying an approach road requiring attention.

  At intersections with traffic regulation signs, drivers may ignore the signs or be unaware of the signs and exit from roads where travel is prohibited, causing a serious accident. There is. In order to avoid such a situation, when a vehicle approaches an intersection including a one-way road, if the driver accidentally enters the road side in the entry prohibition direction, the action is automatically performed. An apparatus that detects and issues a warning is known (Patent Document 1).

JP-A-8-185594

In order to perform safer and smoother driving, it is preferable to prevent the driver from performing an erroneous operation. For this purpose, for example, every time there is a traffic regulation such as entry prohibition, it may be possible to alert the driver of the existence of the traffic regulation.
However, if an alert is issued each time there is a traffic regulation sign, the effect of the alert itself may be diluted. Therefore, it is desired to identify an approach road that requires special attention and to perform more effective alerting.

Therefore, the present inventor has realized that it is only necessary to distinguish an approach road to an intersection with a traffic regulation sign that requires special attention from other approach roads and to issue an alert only for the former.
The inventor considered to identify the approach road to the intersection with a traffic regulation sign that requires special attention based on the traveling history of the probe car. That is, when there is a traveling history of a probe car that violates the traffic regulation information attached to the approach road, the approach road needs special attention and should be distinguished from a general approach road.

In order to achieve this object, the first aspect of the present invention is defined as follows.
An approach road extraction step for extracting an approach road to an intersection with traffic regulation information;
On the basis of the traffic regulation information attached to the intersection, a forbidden exit road extraction step for extracting an exit road that is prohibited from proceeding from the approach road;
A travel history extraction step of processing probe information and extracting a travel history of a probe car that has traveled from the approach road to the travel prohibition exit road;
When the travel history is extracted, a cautionary approach road identification step for identifying the approach road as a cautionary approach road;
How to identify roads requiring attention including

  According to the method for identifying the approach roads requiring attention specified in the first aspect defined in this way, out of the approach roads to the intersection with the traffic regulation information, it is based on the actual traffic regulation violation information by the probe car. Thus, in order to identify the approach road as an approach road that requires special attention, the distinction between the approach road that requires attention and a general approach road is in line with the actual situation. This is because the attention of the driver of the probe car is not particularly inferior, and other drivers are more likely to violate similar traffic rules. In addition, if information on alerting the approach road where the traffic rule violation history is actually provided is provided in advance, it is possible to prevent the driver from making a mistake in the driving operation, and to make driving safer and smoother. .

The second aspect of the present invention is defined as follows. That is,
In the cautionary approach road identification method specified in the first aspect, detailed regulation information is attached to the traffic regulation information,
In the travel history extraction step, probe information that matches the detailed regulation information is processed.
According to the caution required approach road identification method defined in the second situation defined as described above, it is possible to call attention based on the detailed regulation information.
Here, the detailed regulation information refers to information based on the contents of auxiliary signs attached as supplements to the contents of this sign in traffic regulation signs. For example, there are regulations that specify some vehicle types, times, etc. (Third aspect).
Since the auxiliary signs are small, it is difficult to visually recognize the existence of the signs, and the contents of the regulations described on the auxiliary signs often cannot be judged unless they are very close to the intersection. Therefore, if alerting that matches the detailed regulation information is performed in advance, it is possible to prevent an error in the driving operation of the driver, and it is possible to ensure safe and smooth driving of the driver, the following vehicle, and the oncoming vehicle.

The restriction sign in the road sign has high visibility because red is used for the ground color and the frame color, as shown in vehicle closure, maximum speed, and the like. On the other hand, among the restriction signs, the prohibition of advancing outside the designated direction and the one-way sign using blue as the ground color are difficult to see for the driver and may be overlooked. Therefore, the effect of alerting is particularly demonstrated.
Therefore, the fourth aspect of the present invention is defined as follows. That is,
In the method of specifying a cautionary approach road specified in the first to third aspects, the traffic regulation information is out-of-designation direction prohibition information or one-way information.

The fifth aspect of the present invention is defined as follows. That is,
In the caution required approach road identification method defined in the first to fourth aspects, a count step for counting the number of travel histories extracted by the travel history extraction step for each approach road;
A comparison step of comparing the count number counted in the counting step with a predetermined threshold number,
In the caution entry road specifying step, the entry road is specified as a caution entry road for an entry road having the count number equal to or greater than the threshold number.
According to the caution required approach road identification method defined in the fifth aspect defined in this way, when the traveling history of the probe car that has progressed from the approach road to the travel prohibition exit road exists more than a predetermined threshold number, In order to identify an approaching road that requires attention, it is possible to identify an approaching road that has a lot of traffic regulation violation information.

The sixth aspect of the present invention is defined as follows. That is,
An approach road extracting means for extracting an approach road to an intersection with traffic regulation information;
On the basis of the traffic regulation information attached to the intersection, a forbidden exit road extraction means for extracting an exit road that is prohibited from traveling from the entrance road;
Travel history extraction means for processing probe information and extracting a travel history of a probe car that has traveled from the approach road to the travel-prohibited exit road;
When the travel history is extracted, a caution entry road specifying means for specifying the entry road as a caution entry road;
Important road entry device including
According to the invention defined in the sixth aspect defined in this manner, the same effects as in the first aspect are achieved.

The seventh aspect of the present invention is defined as follows. That is,
In the cautionary approach road identification device specified in the sixth aspect, detailed regulation information is attached to the traffic regulation information,
The travel history extracting means processes probe information that matches the detailed regulation information.
According to the invention defined in the seventh aspect defined in this manner, the same effects as in the second aspect are achieved.

The eighth aspect of the present invention is defined as follows. That is,
In the cautionary approach road identification device defined in the seventh aspect, the detailed regulation information is time information or vehicle type information.
According to the invention defined in the eighth aspect defined in this manner, the same effects as in the third aspect are achieved.

The ninth aspect of the present invention is defined as follows. That is,
In the cautionary approach road identification device defined in the sixth to eighth aspects, the traffic regulation information is information that prohibits traveling in a specified direction or one-way information.
According to the invention defined in the ninth aspect defined in this manner, the same effects as in the fourth aspect are achieved.

The tenth aspect of the present invention is defined as follows. That is,
In the caution required approach road identification device defined in the sixth to ninth aspects, the counting means for counting the number of the travel histories extracted by the travel history extraction means for each approach road;
Comparing means for comparing the count number counted by the counting means with a predetermined threshold number,
The attention approaching road identifying means identifies the approaching road as the attention approaching road for the approaching road whose count number is equal to or greater than the threshold number.
According to the invention defined in the tenth aspect defined in this manner, the same effects as in the fifth aspect are achieved.

Furthermore, the eleventh aspect of the present invention is defined as follows. That is,
A computer program for identifying an approaching road that requires attention.
An approach road extracting means for extracting an approach road to an intersection with traffic regulation information;
On the basis of the traffic regulation information attached to the intersection, a forbidden exit road extraction means for extracting an exit road that is prohibited from traveling from the entrance road;
Travel history extraction means for processing probe information and extracting a travel history of a probe car that has traveled from the approach road to the travel-prohibited exit road;
When the travel history is extracted, a caution entry road specifying means for specifying the entry road as a caution entry road,
A computer program characterized by functioning as:
According to the computer program defined in the eleventh aspect defined in this manner, the same effects as in the first aspect are achieved.

The twelfth aspect of the present invention is defined as follows. That is,
In the computer program defined in the eleventh aspect, detailed regulation information is attached to the traffic regulation information,
The travel history extracting means processes probe information that matches the detailed regulation information.
According to the computer program defined in the twelfth aspect defined in this manner, the same effects as those in the second aspect are achieved.

The thirteenth aspect of the present invention is defined as follows. That is,
In the computer program defined in the twelfth aspect, the detailed restriction information is time information or vehicle type information.
According to the computer program defined in the thirteenth aspect defined in this way, the same effects as in the third aspect are achieved.

The fourteenth aspect of the present invention is defined as follows. That is,
In the computer program defined in the eleventh to thirteenth aspects, the traffic regulation information is out-of-designated travel prohibition information or one-way information.
According to the computer program defined in the fourteenth aspect defined in this manner, the same effects as in the fourth aspect are achieved.

The fifteenth aspect of the present invention is defined as follows. That is,
In the computer program defined in the 11th to 14th aspects, the computer is further
Counting means for counting the number of the traveling histories extracted by the traveling history extracting means for each approach road;
Function as comparison means for comparing the count number counted by the counting means with a predetermined threshold number;
The attention approaching road identifying means identifies the approaching road as the attention approaching road for the approaching road whose count number is equal to or greater than the threshold number.
According to the computer program defined in the fifteenth aspect defined in this way, the same effects as in the fifth aspect are achieved.

  A recording medium for recording the computer program defined in the 11th to 15th aspects is defined as the 16th aspect.

It is a block diagram which shows the structure of the attention approach road specific device of embodiment of this invention. It is a block diagram which shows the structure of the driving history extraction part of embodiment of this invention. It is a schematic diagram explaining the extraction method of the driving | running history determined with having exited from the attention approaching road to the prohibition progress road. It is a flowchart which shows operation | movement of the attention approach road specific device of embodiment of this invention. It is a flowchart which shows operation | movement of the driving history extraction part of embodiment of this invention. It is a block diagram which shows the structure of the attention approach road specific device of other embodiment of this invention. It is a flowchart which shows operation | movement of the attention approach road specific | specification apparatus of other embodiment of this invention. It is a block diagram which shows the structure of the attention approach road specific device of other embodiment of this invention. It is a flowchart which shows operation | movement of the attention approach road specific | specification apparatus of other embodiment of this invention. The computer system which comprises the caution approach approach specific | specification apparatus of an Example is shown. It is a block diagram which shows schematic structure of the navigation system using the navigation information specified by the attention approach road specific apparatus of an Example.

In the following, a critical approach road identifying device according to an embodiment of the present invention will be described.
In FIG. 1, the functional block diagram of the attention approach road specific apparatus 1 of this invention is shown. FIG. 2 shows a functional block diagram of the travel history extraction unit 7.
As shown in FIG. 1, the cautionary approach road identification device 1 includes a navigation information storage unit 2, an approach road extraction unit 3, a travel prohibition exit road extraction unit 4, an approach / exit road storage unit 5, a probe information storage unit 6, A travel history extraction unit 7 and a cautionary approach road identification unit 8 are provided.

The navigation information storage unit 2 includes a traffic regulation information storage unit 9, a map information storage unit 10, and a road information storage unit 11.
The traffic regulation information is stored in the traffic regulation information storage unit 9. As the traffic regulation information, for example, digital traffic regulation data provided by the Japan Traffic Management Technology Association can be used. Although not all of the traffic regulation information listed in the digital traffic regulation data is necessary, in the present invention, it is preferable that the traffic regulation information related to the out-of-designated travel prohibition information and the one-way information is stored. Further, in the traffic regulation sign, it is preferable that detailed regulation information as information based on the content of the auxiliary sign attached as a supplement to the contents of the sign is stored. The detailed regulation information includes, for example, detailed regulation information that specifies the time, day of the week, type of automobile, and the like to which the regulation is applied.

Map information is stored in the map information storage unit 10. The map information includes information on road elements for defining map information such as links and nodes, information drawn on the map, and the like.
The road information storage unit 11 stores road information that defines the characteristics of each road element such as roads and intersections. For example, road information that defines road (link) characteristics includes road type, road width, travel restrictions, and others. The road information storage unit 11 includes a cautionary approach road information storage unit 12. As will be described later, in the present invention, an approach road to an intersection with traffic regulation information, which requires special attention, is specified, and road information related to the road element is stored in the road information storage section requiring attention. 12 is set. Moreover, the alert information can be associated with the set road information as necessary.

The approach road extraction unit 3 refers to the traffic regulation information stored in the traffic regulation information storage unit 9 and identifies a road element for which traffic regulation information such as prohibition of traveling outside the designated direction is set. Further, referring to the traffic regulation information and the map information stored in the map information storage unit 10, a road entering the intersection is extracted from the road elements to which the specified traffic regulation information is attached.
The approach road extraction unit 3 can also extract the approach road with reference to information indicating the presence of a median strip or a pole collected by fieldwork or the like. For example, when trying to exit from an approach road with traffic regulation information to a road that is prohibited from proceeding, it is impossible to physically exit if there is a median strip or pole that prevents the exit. . Such an approach road can be excluded from the extraction target of the approach road extraction unit 3.
On the other hand, when exiting from an approach road to a travel-prohibited exit road, if there is no median or the like, it is possible to physically exit, so special attention is required when traveling on the approach road.

  The exit prohibition exit road extraction unit 4 is an exit road from the approach road extracted from the approach road extraction unit 3 and is prohibited from progressing from the approach road based on the attached traffic regulation information. To extract. The extracted travel prohibition leaving road is stored in the approach / exit road storage unit 5 as a set with the approach road extracted by the approach road extraction unit 3.

Probe cars P1, P2,... Pm are wirelessly connected to the probe information storage unit 6 via the network N, and the probe information transmitted from each probe car is stored in the probe information storage unit 6.
The method of transmitting the probe information is not limited to the method via the network, but may be temporarily stored in a memory in the probe car and written to the probe information storage unit 6 directly from the memory or via a wire.
The probe information stored in the probe information storage unit 6 includes at least ID information for identifying a probe car, coordinate information, and time information. Such information can be specified if the vehicle has a position detection function such as GPS. Furthermore, speed information, bearing information, altitude information, accelerator opening, engine speed, longitudinal acceleration, yaw rate, stop lamp, ABS warning lamp, fuel consumption, remaining power capacity, rudder angle (steering wheel rotation angle information), shift It is preferable to provide lever information and the like.
For example, as described in JP-A-2002-150495, a system that performs bidirectional information transmission between a vehicle navigation system and a base station is well known. Therefore, if the information transmission system is used, a general vehicle equipped with a navigation system can be used as a probe car. Of course, this does not exclude the use of a probe car equipped with a dedicated device for collecting road information.

Probe information corrected by map matching or the like can also be used. Thereby, the error contained in probe information can be reduced.
Here, map matching is a technique for preventing the position of the probe car from deviating from the road of the map information in the navigation system, and as a result, the position of the probe car always exists on the road. In order to perform map matching, a travel locus is formed from the coordinate information, direction information, travel distance, etc. of the probe car in the navigation system, and this travel locus is compared with the road shape data in the map information. Since there are a plurality of road shape data, weighting is performed according to a predetermined priority, and one road is selected. Then, the coordinates of the probe car are changed to the coordinates on the road.
For details, please refer to Car Navigation System (Public Data Structure KIWI and its Usage), Chapter 4, Kyoritsu Publishing, etc.
The map matching may be performed on the base station side that has received the probe information from the probe car.

The travel history extraction unit 7 reads the probe information from the probe information storage unit 6 and extracts the probe information of the probe car that is recognized as having traveled from the approach road to the travel-prohibited exit road based on the travel history.
The travel history is extracted in the travel history extraction unit 7 by following the travel history of the probe information in the extraction area set corresponding to the approach road and the travel prohibition exit road, and the vehicle that has progressed to the travel prohibition exit road The travel history to be formed is extracted. The travel history is generated by a probe car that has actually traveled from the approach road to a travel prohibition exit road.

This will be described in detail with reference to the schematic diagram shown in FIG.
As shown in FIG. 3, traffic regulation information for prohibiting traveling outside the designated direction is prohibited for the approach road 101, which prohibits travel other than straight travel and left turn from the approach road 101. The road 102 extending in the right turn direction from the approach road 101 based on the prohibition information outside the designated direction is a travel prohibition exit road that is prohibited from exiting the approach road 101.
As shown in FIG. 3, an extraction area 110 is set for the approach road 101 and the travel prohibition exit road 102. Probe information existing in the extraction area 110 is extracted, and its travel history is traced.
This extraction area 110 gives the width defined by the road information to the link 106 a corresponding to the approach road 101. When there is no information about the width, a predetermined width (for example, 10 m) is given around the link 106a. Similarly, a predetermined width is given to the link 106b corresponding to the travel prohibition leaving road 102. The outer edge of the extraction area 110 with respect to the link 106a and the link 106b is set to a predetermined distance (for example, 50 m) from the node 107 corresponding to the intersection 105.
In the extraction area 110, the travel history 111 formed by the probe information that has exited from the approach road 101 to the travel prohibition exit road 102 is extracted.
When determining whether or not a right turn is made from the locus of probe information, turn signal information, steering wheel angle information, and the like can be referred to.

FIG. 2 shows a functional block diagram of the travel history extraction unit 7.
As illustrated in FIG. 2, the travel history extraction unit 7 includes an extraction region setting unit 71, an extraction region storage unit 72, a probe information reading unit 73, and a probe information extraction unit 74.
The extraction area setting unit 71 automatically sets the extraction area 110 as shown in FIG. 3 based on the information when the information about the approaching road and the travel-prohibited leaving road is sent from the entry / exit road storage unit 5. . The extraction area 110 is stored in the extraction area storage unit 72.
The probe information reading unit 73 reads the probe information stored in the probe information storage unit 6.
The probe information extraction unit 74 extracts probe information existing in the extraction area 110 from the read probe information as a travel history formed from each probe information.
When the travel history extraction unit 7 extracts the travel history from the approach road 101 to the travel-prohibited exit road 102, the approaching approach road specifying unit 8 that requires attention specifies the approach road 101 that requires special attention. The specified information is stored in the attention approach road information storage unit 12 in the road information storage unit 11 as the attention approach road information.

The operation of the cautionary approach road identification device 1 shown in FIGS. 1 and 2 will be described with reference to FIGS. 4 and 5.
Based on the traffic regulation information and the map information, the approach road extraction unit 3 extracts an approach road to the intersection where traffic regulation information such as prohibition of traveling outside the designated direction is set (step 1).
In the extracted approach road, a travel prohibition leaving road from the approach road is extracted based on the attached traffic regulation information (step 3). The travel prohibition leaving road is stored in the entry / exit road storage unit 5 in association with the approach road (step 5).
The travel history of the probe car from the approach road stored in the approach / exit road storage unit 5 to the progress-prohibited exit road is extracted (step 7).

FIG. 5 is a flowchart showing the detailed operation of step 7 shown in FIG.
When extracting a travel history, first, an extraction area for extracting probe information corresponding to the approach road and the travel-prohibited exit road stored in step 5 is set and stored (steps 71 and 72).
In step 75, the probe information extraction unit 74 extracts, from the probe information read out by the probe information reading unit 73, what exists in the extraction region stored in the extraction region storage unit 72 as a travel history formed by the probe information. Among them, the direction information is narrowed down to those proceeding from the approach road to the prohibition exit road. When a travel history exists in the extraction area (step 75), the result is sent to the attention approaching road specifying unit 8, and the approaching road is specified as the attention approaching road (step 9). The identified information is stored in the caution entry road information storage unit 12 as caution entry road information (step 11).
In the above, step 1 to step 9 may be executed on the probe car side. In this case, since the information is sent to the server device only when it is identified as a road requiring attention, the load on the server device can be reduced.

FIG. 6 shows a cautionary approach road identification device 21 of another embodiment. In FIG. 6, the same elements as those of FIG. 1 are denoted by the same reference numerals, and the description thereof is partially omitted.
The caution entry road identification device 21 shown in FIG. 6 is different from the caution entry road identification device 1 shown in FIG. 1 in that a detailed restriction information storage unit 33 is provided in the traffic restriction information storage unit 9.
The detailed restriction information storage unit 33 stores detailed restriction information as information based on the contents of the auxiliary signs attached to supplement the contents of the signs in the traffic restriction signs. The detailed regulation information includes, for example, detailed regulation information that specifies the time, day of the week, and the type of automobile to which the regulation is applied.

In the approach road identifying device 21 requiring attention, the approach road extraction unit 23 refers to the detailed regulation information stored in the detailed regulation information storage unit 33 and extracts the approach road with the detailed regulation information.
The travel history extraction unit 27 extracts the probe information existing in the extraction region set based on the approach road and the travel prohibition exit road stored in the approach / exit road storage unit 5. At that time, the travel history extraction unit 27 refers to the information of the detailed regulation information storage unit 33 and extracts probe information having information that matches the detailed regulation attached to the approach road. This extraction is extracted as a travel history formed by the probe information. When there is a travel history in the extraction area, the caution entry road specifying unit 28 specifies the entry road as a caution entry road and stores the information in the caution entry road information storage unit 32.

The operation of the caution approach road identifying device 21 shown in FIG. 6 will be described with reference to FIG. In FIG. 4, steps that perform the same processing as in FIG. 7 are assigned the same reference numerals, and descriptions thereof are partially omitted.
In FIG. 7, step 21 refers to the detailed regulation information storage unit 33 in the traffic regulation information storage unit 9 and extracts an approach road to which the detailed regulation information is attached. For the extracted approaching road, a forbidden leaving road is extracted and stored in the approaching / leaving road storage unit 5 together with the approaching road (steps 3 and 5).
In step 27, the travel history of the probe car that has exited from the approach road stored in step 5 to the travel-prohibited exit road, the probe car having probe information that matches the detailed restriction information attached to the approach road. Extract history. When there is a travel history in the extraction area, the approach road is identified as a caution approach road and stored (steps 29 and 31). As described above, if a road requiring attention is specified for each detailed regulation information, it is possible to provide guidance that matches the detailed regulation when the information is used in the navigation system.

In FIG. 8, the functional block diagram of the attention approach road specific | specification apparatus 41 of other embodiment is shown. In FIG. 8, the same elements as those in FIGS. 1 and 6 are denoted by the same reference numerals, and the description thereof is omitted.
The caution entry road identification device 41 shown in FIG. 8 differs from the caution entry road identification device 21 shown in FIG. 6 in that a counter 43 and a comparison unit 44 are provided.
When the extracted travel history is sent from the travel history extraction unit 27, the counter 43 counts the number of travel histories for each extraction area, and stores this count number in the counter memory unit in the counter 43. . This count number indicates the number of travel histories existing in the extraction area 110 in FIG.
The count number is compared with a predetermined threshold in the comparison unit 44. That is, when the count number is equal to or greater than the threshold value, the caution entry road specifying unit 48 specifies the approach road as a caution entry road, and sends the specification result to the caution entry information storage unit 52.

The operation of the caution approach road identifying device 41 shown in FIG. 8 will be described with reference to FIG. In FIG. 9, steps that perform the same processing as in FIGS. 4 and 7 are assigned the same reference numerals, and descriptions thereof are partially omitted.
In step 33, the number of extracted travel histories is measured by the counter 43 and compared with a predetermined threshold value in the comparison unit 44. When the number of travel histories is equal to or greater than the threshold (step 33: Yes), the approaching approach road identifying unit 48 identifies the approaching approach road as the approaching approaching road and stores road information in association with the link of the approaching road. It is stored in the caution required approach road information storage unit 52 in the unit 51 (steps 35 and 37).
In this way, when there are many (over a threshold value) that have travel histories that are judged to have progressed from the approach road to the travel-prohibited exit road in the extraction area of the probe car, When the information is used in the navigation system, guidance can be provided by narrowing down the approach road that requires more attention to the driver.

In step 27, in addition to the travel history, information based on a direction change operation of the probe car traveling on the approach road can be extracted as the probe information. Examples of probe information based on the direction change operation include turn signal information and steering wheel angle information. Even if the probe car traveling on the approach road performs a blinker operation to proceed to the prohibition exit road, or if the steering wheel operation at a certain angle or more is performed, the driving operation is actually performed to proceed to the prohibition exit road. Will be. Even on such approach roads, traffic regulations may be violated, so caution is required.
That is, when an operation that violates the traffic regulation is performed on the approach road, the approach road is identified as a caution approach road.

FIG. 10 is a block diagram showing a hardware configuration of the caution approach road identifying device 21.
The hardware configuration of the device 21 is such that various elements are coupled to the central controller 221 via the system bus 222 in the same manner as a general computer system.
The central controller 221 includes a general-purpose CPU, a memory controller, a bus controller, an interrupt controller, and a DMA (direct memory access) device. The system bus 222 also includes a data line, an address line, and a control line. A memory circuit including a RAM (Random Access Memory) 223 and a nonvolatile memory (ROM 224, CMOS-RAM 225, etc.) is connected to the system bus 222. Data stored in the RAM 223 is read or rewritten by the central controller 221 or other hardware elements. The data in the non-volatile memory is read-only, and the data is not lost when the device is turned off. The system program for controlling the hardware is stored in the hard disk device 227 and also stored in the RAM 223, and is read and used by the central control device 221 as appropriate via the disk drive control device 226. The hard disk device 227 has an area for storing a computer program for operating a general-purpose computer system as the caution entry road identifying device 21.
A predetermined area of the hard disk device 227 is allocated for the navigation information storage unit 22.
Other areas of the hard disk device 227 are allocated for the entry / exit road storage unit 5 and the probe information storage unit 6.

Connected to the system bus 222 are a flexible drive control device 231 that reads and writes data from and to the flexible disk 232, and a CD / DVD control device 233 that reads data from the compact disk 234. In this example, a printer 238 is connected to the printer interface 237.
A keyboard / mouse control device 241 is connected to the system bus 222 to enable data input from the keyboard 242 and the mouse 243. A monitor 245 is connected to the system bus 222 via the monitor control device 244. The monitor 245 can be a CRT type, a liquid crystal type, a plasma display type, or the like.
An empty slot 251 is prepared in order to allow the addition of various elements (such as a modem).

  This device 21 is connected to the network N via the network adapter 261. A probe car is connected to the network (Internet) N.

  Programs (OS program and application program (including those of the present invention)) necessary for operating the cautionary approach road identifying device 21 comprising this computer system are installed in the system via various recording media. The For example, it is possible to install in the form of a non-write recording medium (CD-ROM, ROM card, etc.), a writable recording medium (FD, DVD, etc.), or a communication medium using the network N. Of course, these programs can be written in advance in the nonvolatile memories 224 and 225 and the hard disk device 227.

The information in the navigation information storage unit 22 can be used as it is by the navigation system. An example of the navigation system is shown in FIG.
The navigation system 300 includes a control unit 301, a memory unit 302, an input unit 303, an output unit 304, an interface unit 305, a vehicle position specifying unit 306, a search unit 307, and a navigation information storage unit 22.
The control unit 301 is a computer device including a CPU, a buffer memory, and other devices, and controls other elements constituting the navigation system 300. A computer program is stored in the memory unit 302, and the computer program is read into the control unit 301, which is a computer device, and causes it to function. This computer program can be stored in a general-purpose medium such as a DVD.

The input unit 303 is used for setting a destination and the like. As the input unit 303, a touch panel type input device that cooperates with the display content of the display can be used.
The output unit 304 includes a display, and displays map information and other information necessary for navigation. The output unit 304 may include a voice guidance device.
The interface unit 305 connects the navigation system 300 to a wireless network or the like.
The own vehicle position specifying unit 306 detects the current position of the user terminal using a GPS device or a gyro device.

The search unit 307 searches for a route from the designated departure place to the destination. When searching for a route, the search unit 307 refers to the information stored in the navigation information storage unit 22.
If alerting information is added to the attention approaching road information stored in the navigation information storage unit 22, the target to which attention should be paid on the attention approaching road can be made more specific. Thereby, it can concentrate on safe operation. In addition, along with the alert information, providing the reason why the road is prohibited from leaving, such as “Cannot turn right due to restricted time zone”, etc., eliminates the stress of the driver who wants to make a right turn due to a shortcut. It will also lead to doing.

By associating the alert message with the attention approach road, the navigation system 300 can output the alert message when accessing the attention approach road. In this case, the control unit 301 reads out the alert message related to the flag of the approaching approach road information set for the road on the searched route from the alert message storage unit provided in the navigation information storage unit 22. And output via the output unit 304.
Even when the current map is displayed on the display of the output unit 304 of the navigation system 300 without searching for a route, the same processing as described above can be performed for the road on which the host vehicle is traveling.

  Further, the alert message can be output in conjunction with the direction indicator of the vehicle. In this case, a warning message is output when the direction indicated by the direction indicator of the vehicle coincides with the travel-prohibited exit road specified as a set with the approach-important approach road. The timing for outputting the alert message is not particularly limited as long as the vehicle is before entering the intersection (for example, 30 m before). Further, the warning message is output when the vehicle speed at the timing is measured in accordance with the timing at which the warning message is output, and the vehicle speed is equal to or higher than a certain speed (for example, 10 km / h or higher). It is good.

The following matters are disclosed below.
A method for identifying a caution approaching road characterized by extracting an approaching road to an intersection with traffic regulation information having detailed regulation information and identifying the approaching road as a cautionary approaching road.

  The present invention is not limited to the description of the embodiments and examples of the invention described above. Various modifications may be included in the present invention as long as those skilled in the art can easily conceive without departing from the description of the scope of claims.

1 21 41 Caution-requiring approach road identifying device 2 22 42 Navigation information storage unit 3 23 Approach road extraction unit 4 Progress prohibition exit road extraction unit 5 Approach / exit road storage unit 6 Probe information storage unit 7 27 Travel history extraction unit 8 28 48 Important approach road identification unit 9 Traffic regulation information storage unit 10 Map information storage unit 11 31 51 Road information storage unit 12 32 52 Important approach road information storage unit 33 Detailed regulation information storage unit 43 Counter 44 Comparison unit 71 Extraction area setting unit 72 Extraction area storage unit 73 Probe information reading unit 74 Probe information extraction unit

Claims (16)

An approach road extraction step for extracting an approach road to an intersection with traffic regulation information;
On the basis of the traffic regulation information attached to the intersection, a forbidden exit road extraction step for extracting an exit road that is prohibited from proceeding from the approach road;
A travel history extraction step of processing probe information and extracting a travel history of a probe car that has traveled from the approach road to the travel prohibition exit road;
When the travel history is extracted, a cautionary approach road identification step for identifying the approach road as a cautionary approach road;
How to identify roads requiring attention including Detailed traffic control information is attached to the traffic control information.
The method for identifying a road requiring attention according to claim 1, wherein in the travel history extraction step, probe information that matches the detailed regulation information is processed.   The method according to claim 2, wherein the detailed regulation information is time information or vehicle type information.   The method for identifying an approaching road requiring attention according to any one of claims 1 to 3, wherein the traffic regulation information is out-of-designation direction prohibition information or one-way information. A count step of counting the number of the travel histories extracted by the travel history extraction step for each approach road;
A comparison step of comparing the count number counted in the counting step with a predetermined threshold number,
The said approaching approach road specific step identifies this approaching road with a needing approaching road about the approaching road whose said count number is more than the said threshold value number, The Claim 1 characterized by the above-mentioned. How to identify the approaching road that needs attention An approach road extracting means for extracting an approach road to an intersection with traffic regulation information;
On the basis of the traffic regulation information attached to the intersection, a forbidden exit road extraction means for extracting an exit road that is prohibited from traveling from the entrance road;
Travel history extraction means for processing probe information and extracting a travel history of a probe car that has traveled from the approach road to the travel-prohibited exit road;
When the travel history is extracted, a caution entry road specifying means for specifying the entry road as a caution entry road;
Important road entry device including Detailed traffic control information is attached to the traffic control information.
7. The attention-advancing approach road identifying device according to claim 6, wherein the travel history extracting unit processes probe information that matches the detailed regulation information.   8. The attention approach road identifying device according to claim 7, wherein the detailed regulation information is time information or vehicle type information.   The caution required approach road identification device according to any one of claims 6 to 8, wherein the traffic regulation information is out-of-designated travel prohibition information or one-way information. Counting means for counting the number of the traveling histories extracted by the traveling history extracting means for each approach road;
Comparing means for comparing the count number counted by the counting means with a predetermined threshold number,
10. The caution approach road identifying means identifies the approach road as a caution approach road for an approach road with the count number equal to or greater than the threshold number. Important approach road identification device. A computer program for identifying an approaching road that requires attention.
An approach road extracting means for extracting an approach road to an intersection with traffic regulation information;
On the basis of the traffic regulation information attached to the intersection, a forbidden exit road extraction means for extracting an exit road that is prohibited from traveling from the entrance road;
Travel history extraction means for processing probe information and extracting a travel history of a probe car that has traveled from the approach road to the travel-prohibited exit road;
When the travel history is extracted, a caution entry road specifying means for specifying the entry road as a caution entry road,
A computer program characterized by functioning as: Detailed traffic control information is attached to the traffic control information.
The computer program according to claim 11, wherein the travel history extraction unit processes probe information that matches the detailed regulation information.   The computer program according to claim 12, wherein the detailed regulation information is time information or vehicle type information.   The computer program according to any one of claims 11 to 13, wherein the traffic regulation information is out-of-designation direction prohibition information or one-way information. Said computer further
Counting means for counting the number of the traveling histories extracted by the traveling history extracting means for each approach road;
Function as comparison means for comparing the count number counted by the counting means with a predetermined threshold number;
The said approaching approach road specific means identifies this approach road with a needing approach road for the approach road whose said count number is more than the said threshold number, The one of Claims 11-14 characterized by the above-mentioned. Computer program.   The recording medium which records the computer program in any one of Claims 11-15.

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