JPH09251596A - Intersection safety support method and intersection safety support device - Google Patents

Abstract

(57) [Abstract] [Problem] In the process of drafting an improvement plan for an intersection, the problem extraction process of an intersection, which relied only on site observation and analysis,
Provided is an intersection improvement assisting device which assists by using a means for predicting and visualizing a dangerous behavior of a vehicle that may occur in an intersection. SOLUTION: The intersection information inputting means 1 and a means 2 for predicting and displaying a traffic situation occurring in the intersection from the intersection information are provided, and the intersection situation predicting means 2 is a behavior of turning right by cutting a gap of an oncoming vehicle at the time of prediction. The risk behavior predicting means 3 predicts a potentially dangerous behavior at an intersection, and the contact / collision predicting means 4 predicts a phenomenon such as a contact / collision resulting from the predicted dangerous behavior. It is possible to predict the complicated state of the vehicle that will be a clue for problem extraction, and multiple people can share the problem extraction process that was conventionally entrusted to experts, and objectively check the validity of improvement proposals .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intersection safety support method and an intersection safety support device, and more particularly to a traffic accident,
The present invention relates to an intersection safety assistance method and an intersection safety assistance device that assist in a process of extracting an intersection problem that causes traffic congestion and the like and making an improvement plan.

[0002]

2. Description of the Related Art In the conventional procedure for drafting an improvement plan for an intersection, an expert analyzes the state of traffic flow inside the intersection and observes the complexities and stagnant phenomena inside the intersection that cause traffic accidents and congestion. , The geometrical structure of intersections and signal indications (signal indica
This is a procedure of extracting the problem of the pattern and making an improvement plan based on past experience. It depends entirely on human hands and is not automated. The conventional procedure is described in detail, for example, in Chapter 3 of "Planning and Design of Level Intersection-Basic Edition-" (Transport Engineering Research Society). In addition,
According to page 7 of the “Traffic Signal Manual” (Traffic Engineering Research Group), “Signal signal indication” means “At one intersection,
(Or a combination of traffic flows) are given at the same time or the time zone to which the right is assigned.

Considering the automation of the process of drafting an improvement plan for an intersection, as a technique that can be applied, for example, as shown in Japanese Patent Laid-Open No. 3-266031, "Diagnosis Method and System", from past accumulated cases. Taking out diagnostic cases that serve as a reference, diagnosing the similarity for each determinant, comprehensively evaluating by the weight of each determinant, and selecting the value of the selection factor of the diagnosis target based on the value of the most similar selection factor There are diagnostic methods and systems for determining

[0004]

In the above-mentioned conventional manual procedures, the process of extracting the problems of the geometrical structure of the intersection and the signal parameters, especially the procedure of repeating the observation and analysis by visual observation in the field, It was a heavy work because it was included. In addition, the complex phenomenon at the intersection, which is a clue to the problem extraction, is an accidental event, so there is an uncertain factor of waiting for the accidental event, and the work to support the problem extraction is necessary. It was difficult.

An object of the present invention is to avoid the conventional procedure for extracting problems at an intersection, which has been dependent on only site observation / analysis, in the process of drafting an improvement plan for an intersection, which may cause a danger inside the intersection. It is to provide an intersection safety support method that replaces the procedure of predicting and visualizing the current situation and automates it.

Another object of the present invention is that in the process of drafting an improvement plan for an intersection, there is a possibility that a conventional procedure for extracting problems at an intersection, which relied solely on site observation / analysis, may occur within the intersection. It is an object to provide an automated intersection safety support device by replacing it with a procedure of predicting and visualizing a dangerous current situation.

[0007]

In order to achieve the above object, the present invention provides a geometrical structure of at least one intersection,
In the intersection safety support method for extracting the problematic points such as the geometric structure of the intersection and the signal indication based on the intersection information such as the signal indication pattern and the traffic volume by direction, the geometric structure of the intersection, the signal indication pattern, the traffic Interactively input intersection information such as flow conditions, predict potentially dangerous behavior such as intersection between oncoming straight vehicle and right turn vehicle based on the intersection information, and identify contact and collision caused by dangerous behavior We propose an intersection safety support method that predicts and predicts traffic conditions such as intersections and stagnant traffic flows that occur within an intersection.

In order to achieve the above object, the present invention also provides a geometrical structure of an intersection and a signal expression based on intersection information such as at least one geometrical structure of an intersection, a signal display pattern, and traffic volume by direction. In the intersection safety support method for extracting problems such as traffic signs, the driver characteristics that affect the occurrence of traffic accidents by interactively inputting the intersection information such as the geometric structure of the intersection, signal display pattern, traffic flow situation, etc. Based on the intersection information and driver characteristics, a potentially dangerous behavior, such as the intersection of an oncoming straight vehicle and a right-turn vehicle, is predicted, and contact and collision caused by the dangerous behavior are predicted. We propose an intersection safety support method that predicts traffic conditions such as intersections and stagnant traffic flows that occur in Japan.

A static problem that can be determined from the geometric structure included in the intersection information and a dynamic problem that can be determined from the predicted traffic situation can be extracted in parallel.

The procedure for extracting a dynamic problem is to record the situation and the number of occurrences such as traffic flow confusion and stagnant occurring in each time period in synchronization with signal indication, and extract the problem. Is a procedure for displaying it as information for.

An improvement plan for solving the extracted problems can be planned and presented. In addition, the improvement cases that were made in relation to various intersections in the past are stored in advance, and based on the extracted problems, the problems before the improvement and the details of the improvement of the case where the situation before the improvement is the most similar from the stored improvement cases Alternatively, the difference between the two intersections may be extracted, and the improvement content of the most similar case may be further corrected and / or supplemented in consideration of the difference, and the improvement original plan may be drafted.

When inputting the road shape, it is also possible to select one of a plurality of prepared topologies and input the geometric structure of the road shape.

As the parameter of the driver characteristic given to each vehicle in the traffic flow, the distance to the oncoming straight vehicle at the time of turning right, the speed at the time of passing through the intersection, the probability of a look aside that the stop timing is delayed due to a look aside, etc. are set.

In order to achieve the above-mentioned other objects, the present invention is based on at least one intersection geometrical structure, signal display pattern, traffic information for each direction, and the like, based on intersection information such as a geometrical structure and signal representation of an intersection. In an intersection safety support device for extracting problems such as traffic signs, an intersection information input means for interactively inputting intersection information such as the geometric structure of the intersection, signal display patterns, traffic flow status, and a traffic status prediction means are provided. The traffic condition prediction means includes a dangerous behavior prediction means that predicts a potentially dangerous behavior such as an intersection between an oncoming straight vehicle and a right-turn vehicle based on the intersection information, and a contact or collision caused by the dangerous behavior. The present invention proposes an intersection safety support device, which is composed of predicting contact and collision predicting means and is a means for predicting traffic conditions such as intersections and stagnant traffic flows occurring at intersections.

In order to achieve the above-mentioned other objects, the present invention also provides a geometric structure of at least one intersection, a geometric structure of an intersection based on intersection information such as a signal display pattern, traffic volume by direction, and the like. An intersection safety input device for interactively inputting intersection information such as a geometric structure of an intersection, a signal display pattern, and a traffic flow situation, and a traffic situation prediction means in an intersection safety support device for extracting a problem such as a signal presentation. And a driver characteristic setting unit that sets a driver characteristic that affects the occurrence of a traffic accident, and the traffic condition prediction unit is
Dangerous behavior prediction means for predicting potentially dangerous behavior such as intersection between oncoming straight vehicle and right turn vehicle based on intersection information and driver characteristics, contact generated by dangerous behavior,
The present invention proposes an intersection safety support device, which is composed of contact and collision prediction means for predicting a collision, and is a means for predicting traffic conditions such as intersection and stagnant of traffic flows occurring at an intersection.

It is possible to provide a problem extracting means for extracting in parallel a static problem that can be determined from the geometric structure included in the intersection information and a dynamic problem that can be determined from the predicted traffic situation.

The problem extracting means compares the static information about the geometric structure included in the intersection information with a preset reference condition and extracts an item that does not satisfy the reference condition as a problem, and a traffic condition determining means. The intersection point extraction means that extracts the point where the traffic flow intersects based on the traffic situation inside the intersection predicted by the situation prediction means, and the vehicle stopped despite the traffic light in front being blue Occasionally, the number of times is counted by direction and cause, and is counted as the number of traffic jams for each cycle, a stop frequency calculation means, a condition determination means,
It consists of intersection point extraction means and problem / occurrence point display means for displaying the problems extracted by the stop count calculation means on the intersection display screen, and they occur in each time zone in synchronization with the signal display. It is a means for recording the situation such as traffic flow confusion and staying and the number of occurrences, and displaying it as information for extracting problems.

It is also possible to provide an improvement plan making support means for making and presenting an improvement plan for solving the extracted problems.

Further, based on the intersection information storage means for storing in advance the improvement cases made at various intersections and the problems extracted by the problem extracting means, the stored improvement cases are in a state before the improvement. Is a similar case reference means for extracting problems and improvement contents before improvement of the most similar case and a difference between both intersections, and further improving and / or supplementing the improvement content of the most similar case in consideration of the difference. An improved drafting support means for drafting the original draft may be provided.

The intersection information input means may include a topology generation means for selecting one of a plurality of prepared topologies and inputting the geometrical structure of the road shape.

The driver characteristic setting means gives the distance to the oncoming straight vehicle at the time of a right turn as a parameter of the driver characteristic to be given to each vehicle in the traffic flow, the speed at the time of passing an intersection, the inattentive probability that the stop timing is delayed due to inattentiveness, Etc. is a means for setting.

In the present invention thus constituted, various traffic flow phenomena that may occur even if the user does not necessarily go to the site need only enter the information such as the geometrical structure of the intersection and the traffic volume. It is possible to predict under conditions and extract and visualize problems of dynamic traffic flow. Needless to say, the information accumulated so far in the traffic monitoring system of the traffic control center may be used as the information such as the geometric structure of the intersection and the traffic volume.

In addition, it is possible to predict a complicated vehicle-to-vehicle phenomenon that is a clue for problem extraction, and to share the decision-making process of problem extraction, which was conventionally left to the expert, among a plurality of persons in charge to make a judgment. Since it is possible to objectively check that there is no error in the process and the result, it becomes easier and easier to work on the drafting of the improvement plan for the intersection, which was conventionally done manually only by experienced experts. .

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to FIGS.
Embodiments of an intersection safety support method and an intersection safety support device according to the present invention will be described. Here, in order to simplify the description and facilitate understanding, an example of a single intersection will be described, but it is clear from the following description that the present invention can be applied to a road network including a plurality of intersections. Will be.

<< Embodiment 1 >> FIG. 1 is a block diagram showing a structure of an embodiment 1 of an intersection safety support device according to the present invention. The intersection safety support device in FIG. 1 predicts and displays a traffic situation occurring in an intersection based on the intersection information input means 1 for newly inputting information about the intersection and the information about the intersection input by the intersection information input means 1. Traffic condition predicting means 2. Traffic situation prediction means 2
Is a dangerous behavior prediction unit 3 that predicts a potentially dangerous behavior at an intersection, such as a gap right-turning behavior that makes a right turn through a gap of an oncoming vehicle when predicting traffic conditions, and a risk predicted by the dangerous behavior prediction unit 3. Contact / collision predicting means 4 for predicting a phenomenon such as contact / collision that occurs as a result of behavior
Consists of

<Embodiment 2> FIG. 2 is a block diagram showing the structure of Embodiment 2 in which a driver characteristic setting means 5 is added to the intersection safety support device of Embodiment 1. The driver characteristic setting means 5 individually sets the traveling characteristics of the vehicle used when the traffic situation predicting means 2 predicts the traffic situation.

<Third Embodiment> FIG. 3 is a block diagram showing the structure of a third embodiment in which a problem extracting means 6 is added to the intersection safety support device of the second embodiment. The problem extraction unit 6 is a static problem of an intersection that can be determined from the information input by the intersection information input unit 1 and a dynamic intersection that can be extracted from the contact / collision predicted by the traffic condition prediction unit 2. Extract the problem and.

<Embodiment 4> FIG. 4 is a block diagram showing the structure of Embodiment 4 in which an improvement plan making support means 7 is added to the intersection safety support device of Example 3 to make an improvement plan. The improvement plan support means 7 formulates an improvement plan based on the problems extracted by the problem extraction means 6.

<Embodiment 5> FIG. 5 shows an intersection safety support device of Embodiment 4 to which an intersection information storage means 8 and a similar case reference means 9 are added, and based on the extracted problems, It is a block diagram which shows the structure of Example 5 which designs an improvement plan, referring an example. The similar case reference unit 9 retrieves past intersection improvement examples having similar characteristics and problems such as intersection geometric structure from the intersection information storage unit 8 with respect to the intersection to be improved, and presents it as an improvement reference plan.
The improvement plan support means 7 in the fifth embodiment further corrects and / or supplements the improvement contents of the intersection improvement example presented by the similar case reference means 9 to make a new improvement original plan of the target intersection.

In order to avoid duplication of explanation, the first to fifth embodiments will be described.
Will be described collectively.

FIG. 6 is a block diagram showing an example of the structure of the intersection information input means 1. The intersection information input means 1
Input screen control means 101 and interactive input screen generation means 10
2, input information format conversion means 103, and input omission check means 104. Input screen control means 1
01 controls the display order of screens for information input. The dialogue input screen generation means 102 displays the dialogue input screen designated by the input screen control means 101. The input information format conversion means 103 checks the input of information by the person in charge on the dialogue input screen generated by the dialogue input screen generation means 102 and checks that there is no error. Is converted into a predetermined format for processing in the intersection safety support device. The input omission check means 104 checks whether the information input on the dialog input screen includes an item of omission of input.

FIG. 7 is a block diagram showing an example of a more detailed configuration of the dialogue input screen generating means 102, and FIGS. 8, 9, 10, 11, and 12 correspond to each means in FIG. It is a figure which shows the example of the screen display. 8 is an example of a screen display of the topology generation means 121, FIG. 9 is an example of a screen display of the link information addition means 122, and FIG.
Is an example of a screen display of the lane information adding means 123,
FIG. 11 is an example of a screen display of the facility information adding means 124, and FIG. 12 is an example of a screen display of the traffic flow information adding means 125.

The procedure for generating the dialog input screen will be described in the order of the respective means shown in FIG. In the topology generation means 121, as shown in FIG. 8, the prepared topology is selected and the shape of the input intersection is determined. In the link information adding means 122, the number of lanes is added to the topology determined by the topology generating means 121, as shown in FIG.
Add link information such as speed limit. As shown in FIG. 10, the lane information adding means 123 adds information such as a lane direction attribute to the lane generated by the link information adding means 122. As shown in FIG. 11, the facility information adding means 124 adds facility information such as a pedestrian crossing and a road flow display. In the traffic flow information adding means 125, as shown in FIG. 12, traffic flow information such as traffic volume, right / left turn rate, pedestrian crossing time, and signal parameters are input.

For inputting all information, for example, as shown in FIG. 8, a mouse 81 is used to display a shape display window 82.
An object such as a target link is selected from, an item is selected on the window 83, and a numerical value is input from a keyboard (not shown) for processing.

When the information is interactively input in such a procedure, the necessary information is input by the traffic condition predicting means 2,
It is converted into a predetermined format by the input information format conversion means 103 in FIG.

Next, the traffic condition predicting means 2 will be described in more detail. The traffic situation predicting means 2 in the present invention includes a micro traffic flow simulator that independently calculates and displays the movement of each vehicle. Regarding conventional micro traffic flow simulators, for example, Masataka Kagezawa et al. "Object-oriented traffic flow micro simulator": The Institute of Electrical Engineers of Japan Material
(Road Traffic), RTA-91-27 (1991), pages 57-65. The feature of the micro traffic flow simulator of the present invention is that in addition to the means of the conventional micro traffic flow simulator, in order to specifically predict the behavior of the vehicle at the intersection, the dangerous behavior prediction means 3 and the contact / collision prediction means 4 are provided. Is equipped with.

The dangerous behavior predicted by the dangerous behavior predicting means 3 is, for example, a gap right turn behavior in which a vehicle makes a right turn through an oncoming vehicle. It is assumed that each vehicle attempting to make a right turn is judged to be safe if it has an oncoming distance greater than or equal to a predetermined value, and turns right. The dangerous behavior prediction means 3 predicts a phenomenon such as an intersection between a straight-ahead vehicle and a right-turn vehicle at an intersection. The dangerous behavior prediction means 3 further predicts detailed behavior that causes retention or intersection at an intersection, such as when the following vehicle runs while avoiding a vehicle waiting for a right turn or when the vehicle stops due to insufficient width. .

The contact / collision predicting means 4 intersects, contacts, or collides with the intersection, contact, or collision predicted by the dangerous behavior predicting means 3 when the approach or overlap occurs in the coordinate calculation of the positions of a plurality of vehicles. Is a means for detecting the occurrence of.

Next, the driver characteristic setting means 5 will be described in detail with reference to FIGS. 13 and 14. FIG. 13 is a schematic diagram of an intersection for explaining the parameters set by the driver characteristic setting means 5. When predicting the traffic conditions inside the intersection in the intersection condition predicting means 2, the driver characteristic setting means 5 tests the risk of accident occurrence under the condition that drivers with various characteristics coexist. Is a means for probabilistically setting the attributes of the vehicle.

In FIG. 13, three vehicles 131, 132, 1
33 is passing through the intersection. The vehicle 131 is traveling straight at a speed V, and the vehicle 132 is about to turn right.
The following vehicle 133 is traveling following the right turn vehicle 132.

As characteristics of each vehicle that causes an accident when traveling at an intersection, for example, the following three points are a. Velocity when passing an intersection V b. Distance Lc between the right-turn vehicle 132 and the oncoming vehicle 131 when making a right turn through the gap between the oncoming vehicles. The inattentive probability P (x) is considered.

The inattentive probability P (x) is a setting parameter for simulating a phenomenon in which the brake is delayed when the driver is looking aside when the preceding vehicle suddenly stops in the actual traffic flow. is there. This inattentive probability P (x)
When is set, the vehicle arriving just before the intersection is temporarily stopped at the inattentive probability P (x), which has set the recognition of the events occurring around. For example, if the following vehicle 133 in FIG. 13 does not recognize the stop of the preceding right-turn vehicle 132 and does not change the speed, it will collide with the right-turn vehicle 132 as it is. If such a phenomenon is probabilistically generated, it is possible to predict a rear-end collision that may occur even with an inattentive look.

FIG. 14 shows an example of the parameter setting screen. The characteristic between the oncoming vehicles of the right turn vehicle 132 is set, for example, as a probability distribution 141. The probability distribution 141 shows the existence ratio of vehicles having the characteristic of making a right turn when the oncoming vehicle distance is equal to or greater than the value on the horizontal axis when making a right turn. In the example of the probability distribution 141, the ratio of vehicles turning right is the largest when the oncoming distance is 50 m. When setting the probability distribution, the probability distribution 141, which is the sum of the occurrence probabilities, is normalized and set so that the area surrounded by the probability distribution 141 is 1. Various concrete setting methods are possible, but it is possible to use both the mode in which the probability value is set finely and the mode in which some probability distribution patterns are prepared in advance and only the pattern is selected from them. It is possible to use different methods depending on the case. Similarly, the velocity characteristic is set like the probability distribution 142. The inattentive probability is numerically set as a probability value 143.

When a vehicle is generated in the traffic flow predicting means 2, each characteristic is assigned to each vehicle based on the probability distribution or probability set as a parameter. The characteristics of each vehicle are reflected as the traveling characteristics when the vehicle is generated by the traffic flow prediction means 2 and travels within the set intersection. The person in charge uses the traffic flow predicting means 2 to predict the status of the traffic flow under various possible conditions while changing the parameters. Also, for example, if there are actual measurement values accumulated daily at the traffic control center,
Adopting it as a parameter gives a more realistic result.

FIG. 15 is a diagram showing an example of the configuration of the problem extracting means 6. The intersection information input means 1, the traffic situation predicting means 2 in the intersection, and the problem extracting means 6 correspond to the respective means in the third embodiment of FIG.

The problem extracting means 6 visually displays on the road the occurrence of intersections and collisions predicted by the intra-intersection traffic condition predicting means 2, and statistically records the occurrence of those phenomena, Display as information for analyzing the problem. The recording and display timings can be set arbitrarily. Actually, it is desirable to record the situation such as the traffic flow confusion and staying occurring in each time zone and the number of occurrences in synchronization with the signal display, and display it as information for extracting a problem.

The problem extracting means 6 is the condition judging means 151.
Intersection point extraction means 152 and stop count calculation means 153
And a problem / occurrence location display means 154.
The condition determination means 151 compares the static information input from the intersection information input means 1 with a preset reference condition,
Items that do not meet the standard conditions are extracted as problems. The intersection point extracting unit 152 extracts a point where the traffic flow intersects based on the traffic situation in the intersection predicted by the traffic situation predicting unit 2. The stop count calculating means 153 counts the number of times by direction and cause when the vehicle stops, even though the front signal is blue and the traffic is given. Tally.
The problem / occurrence point display means 154 is the condition determination means 15
1 and the problem points extracted by the intersection extraction unit 152 and the stop count calculation unit 153 are displayed on the intersection display screen.

FIG. 16 shows a problem / occurrence point display means 15
4 is an example of a display screen of No. 4. In the window 161, static problems such as the geometric structure extracted by the condition determining unit 151, the number of traffic jams counted by the intersection extracting unit 152, and the occurrence of intersection and retention detected by the direction identifying unit 153. Show status and. In this example, the stop line distance between the inflow port A and the inflow port B is determined to be longer than the reference value by the condition determination means 151 and is displayed as a problem. The number of stops for each inflow port counted by the number-of-stops calculation unit 153 is totalized and displayed for each cycle in the window 162. Intersection point extraction means 152
The location of the contact / collision extracted in (4) is displayed as a black circle in the window 162. The attribute by direction of the contacting vehicle is also displayed in the window 161.

By adopting the above configuration, it is possible to predict traffic flow generated under various conditions, visualize dynamic problems that may occur, and display them together with static problems such as geometric structure.

Further, as shown in the fifth embodiment of FIG. 5, an intersection information storage means 8 for storing cases of intersections which have been improved in the past, a similar case reference means 9, and an improvement plan planning support means 7 are added. Then, an improvement plan for the extracted problem can be drafted with reference to the similar examples in the past.

Regarding the similar case reference means 9, as described in Japanese Patent Laid-Open No. 3-266031 already mentioned as a conventional example, the degree of similarity is determined for each attribute forming the feature of the diagnosis object, and for each attribute. It may be inferred that the method of finding the similarity based on the weight of can be applied as it is.

However, even in the most similar cases in the past, if there are any differences, human factors may be at risk due to the different factors. Therefore, it is appropriate to apply the improved contents as they are. is not.

In the present invention, the similar case is referred to by the processing procedure of the similar case reference means 9 shown in FIG.
After clarifying the difference between the presented similar case and the intersection to be improved, the contents of the improvement of the intersection improvement example are further corrected and / or supplemented so that a new original draft of the improvement of the target intersection is drafted. There is.

FIG. 18 is a diagram showing an example of the display of a list of items and attributes representing the characteristics of intersections. Each item is
It was chosen so that the features of the intersection could be described in order to derive an improvement plan. Assuming that these setting items and attributes are set for each of the past improvement cases stored in the intersection information storage means 8, the processing procedure of the similar case reference means 9 will be described with reference to FIG.

Process 121: Selects automatic extraction or manual extraction of similar cases. In the case of automatic extraction, move to processing 122,
In the case of manual extraction, the process moves to 126. Process 122: In the case of automatic extraction, the number n of similar cases to be presented
Enter Process 123: Evaluate the degree of similarity. Here, when the similarity is evaluated, based on the item list as shown in FIG. 18, 1 is set when the attributes of the respective items match, and 0 is set when the attributes do not match, and stored in the intersection information storage unit 8. Evaluate the degree of similarity of all the given cases. Process 124: Select n similar cases from all cases in descending order of similarity. Process 125: Display n selected similar cases on the display screen. Process 126: On the other hand, in the case of manual detection, search conditions are set. The search condition is as shown in FIG.
It is set to search for cases in which the attributes are matched by selecting one of the items in the item list. Process 127: A case that meets the set conditions is searched. Process 128: When a match is found, the corresponding number is displayed on the screen. Process 129: Select whether or not to continue the search.
When continuing, the process returns to the process 126, another item is selected as a condition, and the processes from the process 126 to the process 129 are repeated. Process 130: If the process 129 does not continue, the similar case of the search result is displayed.

Improvement planning support means 7 of the fifth embodiment shown in FIG.
Is further corrected and / or supplements the improvement content in the similar case presented by searching from the intersection information storage means 8 by the similar case reference means 9 to create an improvement plan for the intersection to be improved.

In the conventional intersection improvement method, the signal parameter is calculated by using the saturation by direction of the intersection.
As already mentioned, it is dangerous to apply the improved contents as they are, even in the most similar cases in the past, if there are any differences. It is necessary to clarify the difference between the intersection to be improved and the presented similar case, and then correct the measures for the similar case to make a new improvement plan.

In this embodiment, the signal parameter calculation rule is automated, the optimum number of seconds for each signal display is calculated from the traffic volume input by the intersection information input means 1, and the similar case reference means 9 is used. Supplement the improvements in the presented similar case. In addition, the characteristics of the intersections to be improved and similar cases before countermeasures are compared to detect differences, delete inappropriate countermeasures from similar cases, and check that there are problems but no countermeasures are taken. Add or correct the improvement contents.

FIG. 19 is a diagram showing an example of a screen display when the improvement plan making support means 7 of the fifth embodiment shown in FIG. 5 is operated. The window 191 displays the improvement target intersection along with the improvement contents of the similar improvement case. Window 1
Reference numeral 92 displays the presenting parameter proposal calculated by the improvement proposal planning means 9 and the difference. The window 193 displays the improvement plan which was made in consideration of those differences.

As shown in the fifth embodiment, using the extracted problem of the intersection, an intersection having similar characteristics including the problem is referred to from the past improvement cases, and the improvement contents of the past improvement cases are corrected. Then, and / or as a supplement, it is possible to make a plan based on an improvement plan actually used in the past, rather than a plan from scratch, and quickly create an improvement plan suitable for the actual situation. Further, when the effects after the improvement such as the number of accidents are accumulated in the intersection information storage means 8 together with the contents of the improvement, when the similar case reference means 9 is operated, the improvement cases having the high effect are referred to, and those improvement cases are referred Based on this, a better improvement plan can be formulated.

When the improvement plan making means 7 is independently installed as in the fourth embodiment of FIG. 4 without providing the intersection information storage means 8 and the similar case reference means 9 of the fifth embodiment, Although the display of the similar intersection and the display of the different point in FIG. 19 are not displayed, the improvement target intersection is displayed in the window 131, the proposed parameter proposal is displayed in the window 132, and the improvement proposal is automatically shown in the window 133. Therefore, it is possible to obtain the effect of the present invention that the procedure for extracting a problem at an intersection and presenting an improvement plan is automated.

[0062]

According to the present invention, the geometrical structure of the intersection,
Just by entering information such as traffic volume, you do not necessarily go to the site, predict the possible traffic flow phenomenon under various conditions, extract dynamic traffic flow problems, and check the intersection Since it can be visualized together with the general problems, the site observation of the intersection can be omitted in the conventional intersection improvement planning process.

Furthermore, by predicting a complex vehicle-to-vehicle phenomenon that is a clue for problem extraction, a plurality of persons in charge can share the decision making in the problem extraction process, which was conventionally left to the expert, among a plurality of persons in charge. Since it is possible to objectively check that there is no error in the process and the result, it becomes easier and easier to work on the drafting of the improvement plan for the intersection, which was conventionally done manually only by experienced experts. .

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a first embodiment of an intersection safety support device according to the present invention.

FIG. 2 is a block diagram showing a configuration of a second embodiment of an intersection safety support device according to the present invention.

FIG. 3 is a block diagram showing a configuration of an intersection safety support device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a fourth embodiment of an intersection safety assistance device according to the present invention.

FIG. 5 is a block diagram showing a configuration of an intersection safety support device according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing an example of a configuration of intersection information input means.

FIG. 7 is a block diagram showing an example of a more detailed configuration of a dialogue input screen generation means.

FIG. 8 is an example of a screen display of the topology generation means.

FIG. 9 is an example of a screen display of link information adding means.

FIG. 10 is an example of a screen display of lane information adding means.

FIG. 11 is an example of a screen display of facility information adding means.

FIG. 12 is an example of a screen display of traffic flow information adding means.

FIG. 13 is a schematic diagram of an intersection for explaining parameters set by driver characteristic setting means.

FIG. 14 is an example of a parameter setting screen.

FIG. 15 is a diagram showing an example of a configuration of a problem extracting means.

FIG. 16 is an example of a display screen of a problem / occurrence location display means.

FIG. 17 is a diagram illustrating an example of a processing procedure of similar case reference means.

FIG. 18 is a diagram showing an example of a display of a list of items and attributes representing intersection features.

FIG. 19 is a diagram showing an example of a screen display when the improvement plan making support means of the fifth embodiment is operated.

[Explanation of symbols]

 1 intersection information input means 2 traffic condition prediction means 3 dangerous behavior prediction means 4 contact and collision prediction means 5 driver characteristic setting means 6 problem extraction means 7 improvement planning support means 8 intersection information storage means 9 similar case reference means 81 mouse 82 window 83 window 101 input screen control means 102 interactive input screen generation means 103 input information format conversion means 104 input leakage check means 121 topology generation means 122 link information addition means 123 lane information addition means 124 facility information addition means 125 traffic flow information addition Means 131 Straight-going vehicle 132 Right-turning vehicle 133 Follow-up vehicle 141 Right-turning vehicle-to-vehicle distance distribution probability 142 Straight-ahead vehicle speed distribution probability 151 Condition determining means 152 Intersection point extracting means 153 Stop frequency calculating means 154 Problem / occurrence point displaying means 161 Window 62 window 171 to 180 processing 191 window 192 window 193 window

Front Page Continuation (72) Inventor Yoshizo Ito 52-1 Omika-cho, Hitachi City, Ibaraki Hitachi Ltd. Omika Factory, Hitachi Ltd. (72) Inventor Yutaka Sano 5-2-1 Omika-cho, Hitachi City, Ibaraki No. Incorporated company Hitachi, Ltd. Omika factory (72) Inventor Yoshiki Kobayashi 7-1, 1-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi Research Laboratory

Claims (16)

[Claims] 1. A geometrical structure of at least one intersection,
An intersection safety assistance method for extracting a problem such as a geometric structure of the intersection and a signal display based on intersection information such as a signal display pattern and traffic volume by direction, wherein the geometric structure of the intersection and the signal display pattern , Interactively input intersection information such as traffic flow status, predict potentially dangerous behavior such as intersection between oncoming straight vehicle and right-turn vehicle based on the intersection information, and generate due to the dangerous behavior An intersection safety support method, which predicts a contact or a collision, and predicts a traffic situation such as an intersection or a stay of a traffic flow occurring in the intersection. 2. Geometrical structure of at least one intersection,
An intersection safety assistance method for extracting a problem such as a geometric structure of the intersection and a signal display based on intersection information such as a signal display pattern and traffic volume by direction, wherein the geometric structure of the intersection and the signal display pattern ， Interactively input intersection information such as traffic flow status and set driver characteristics that affect the occurrence of traffic accidents. Based on the intersection information and the driver characteristics, the intersection of an oncoming straight vehicle and a right-turn vehicle Such as a potentially dangerous behavior, predicting a contact or a collision that occurs due to the dangerous behavior, and predicting a traffic situation such as intersection or stagnant traffic flow occurring at the intersection. Intersection safety support method. 3. The intersection safety support method according to claim 1, wherein a static problem that can be determined from the geometric structure included in the intersection information and a dynamic problem that can be determined from predicted traffic conditions. An intersection safety support method characterized by extracting points and points in parallel. 4. The intersection safety support method according to claim 3, wherein the procedure for extracting the dynamic problem is such that the traffic flow is complicated or stagnant in each time period in synchronization with the signal display. An intersection safety support method characterized by a procedure of recording the situation and the number of occurrences, and displaying the information as information for extracting a problem. 5. The intersection safety support method according to claim 3 or 4, wherein an improvement plan for solving the extracted problems is drafted and presented. 6. The intersection safety support method according to claim 3 or 4, wherein improvement examples made in the past regarding various intersections are stored in advance, and based on the extracted problems, improvements are made from the stored improvement examples. The problem and improvement contents before improvement of the case with the most similar situation in the previous situation and the difference between both intersections are extracted, and the improvement contents of the most similar case are further corrected and / or supplemented in consideration of the difference, and An intersection safety support method characterized by drafting a draft. 7. The intersection safety assistance method according to claim 1, wherein any one of a plurality of prepared topologies is selected to input the geometrical structure of the road shape. Intersection safety support method. 8. The intersection safety assistance method according to any one of claims 2 to 7, wherein the parameter of the driver characteristic to be given to each vehicle in the traffic flow is an oncoming straight ahead vehicle when turning right. An intersection safety support method characterized by setting the distance, the speed at the time of passing an intersection, and the probability of a look aside that causes the stop timing to be delayed due to a look aside. 9. Geometrical structure of at least one intersection,
An intersection safety support device for extracting problems such as the geometric structure of the intersection and the signal display based on the intersection information such as the signal display pattern and the traffic volume by direction, wherein the geometric structure of the intersection and the signal display pattern An intersection information input unit for interactively inputting intersection information such as traffic flow conditions, and a traffic condition prediction unit, wherein the traffic condition prediction unit intersects the oncoming straight ahead vehicle and the right turn vehicle based on the intersection information. A dangerous behavior prediction means for predicting a potentially dangerous behavior, such as contact, a collision prediction means for predicting a collision or a collision caused by the dangerous behavior, and a traffic flow intersection occurring in the intersection. An intersection safety support device characterized by being a means for predicting traffic conditions such as traffic and stagnation. 10. An intersection safety support for extracting a problem such as the geometric structure of the intersection, the signal display, etc. based on the intersection information such as at least one of the geometric structure of the intersection, the signal display pattern, and the traffic volume for each direction. In the device, an intersection information input means for interactively inputting intersection information such as the geometric structure of the intersection, a signal display pattern, and a traffic flow situation, a traffic situation prediction means, and a driver that influences the occurrence of a traffic accident. A driver characteristic setting means for setting a characteristic, wherein the traffic condition predicting means is a potentially dangerous behavior such as an intersection between an oncoming straight vehicle and a right-turn vehicle based on the intersection information and the driver characteristic. And a collision / collision predicting means for predicting a contact / collision that occurs due to the dangerous behavior. Intersection safety support device, characterized in that the means for predicting the traffic situation. 11. The intersection safety assistance device according to claim 9 or 10, wherein a static problem that can be determined from the geometric structure included in the intersection information and a dynamic problem that can be determined from predicted traffic conditions. An intersection safety assistance device comprising a problem extracting means for extracting points in parallel. 12. The intersection safety support device according to claim 11, wherein the problem extracting unit compares static information regarding a geometric structure included in the intersection information with a preset reference condition. Condition determination means for extracting an item that does not satisfy as a problem, an intersection point extraction means for extracting a point where the traffic flow intersects based on the traffic situation in the intersection predicted by the traffic situation prediction means, and a front signal Stop count calculation means for counting the number of times by direction and cause and summing up as traffic congestion number for each cycle when the vehicle stops even though the right to pass is given in blue, the condition determination means, the intersection point It is composed of a problem point / occurrence point display means for displaying the problem points extracted by the extraction means and the stop count calculation means on the intersection display screen. In a situation occurrences such as conflicting or retention of traffic flow records generated, intersection safety support device, characterized in that the means for displaying the information for the problem extraction. 13. The intersection safety assistance device according to claim 11 or 12, further comprising: an improvement plan making support means for making and presenting an improvement plan for solving the extracted problems. Intersection safety support device. 14. The intersection safety support device according to claim 11 or 12, and intersection information storage means for storing in advance improvement examples made for various intersections in the past, and problems extracted by the problem extraction means. Based on the above, similar case reference means for extracting the problem before the improvement and the content of the improvement of the case in which the situation before the improvement is the most similar from the stored improvement case, and the similar case reference means for considering the difference, An intersection safety support device comprising an improvement plan making support means for further correcting and / or supplementing the improvement contents of the most similar case and making an improvement original plan. 15. The intersection safety assistance device according to any one of claims 9 to 14, wherein the intersection information input means selects one of a plurality of topologies prepared in advance to geometrically determine a road shape. An intersection safety support device including a topology generation unit for inputting a structure. 16. The intersection safety assistance device according to claim 10, wherein the driver characteristic setting means turns right as a parameter of the driver characteristic given to each vehicle in the traffic flow. An intersection safety support device, which is a means for setting a distance to an oncoming straight vehicle, a speed at the time of passing an intersection, a probability of a look aside such that a stop timing is delayed due to a look aside, and the like.