JPH10307983A - Traffic simulation method for road under construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quantitatively grasp the occurrence of traffic snarls, etc., and to set the proper 'blue hours' and signal switching time by setting previously the alignment of peripheral roads including a road construction block, the road shapes, the traffic conditions, etc., and performing the traffic simulation in consideration of each set information. SOLUTION: An input data generating system 10 previously sets the alignment and shapes of peripheral roads including a road construction block, the control systems and signals prepared in the construction block and the intersections which are set before and after the construction block, the moving performance of vehicles of each type, the reaction delay time in every vehicle starting state and the judgment reference for change of single lane in a right/left turn mode respectively. Meanwhile, a simulation execution system 20 calculates the acceleration, velocity and position coordinates of every vehicle at each fixed time according to a microscopic traffic flow model and based on the model and data which are set by the system 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic simulation method for traffic conditions on a peripheral road including a road construction section.

[0002]

2. Description of the Related Art At present, when performing road construction with traffic regulation, traffic congestion may be caused by traffic conditions and traffic regulation methods, and this traffic congestion is a serious problem. For the purpose of avoiding or alleviating this traffic jam, a method of performing a traffic simulation at high speed and with high accuracy as disclosed in Japanese Patent Application Laid-Open No. 5-250594,
There has been a traffic control method in a road construction section as disclosed in Japanese Patent Application Laid-Open No. Hei 7-21490.

[0003]

However, in the conventional method as described above, the method disclosed in Japanese Patent Application Laid-Open No. 5-250594 does not accurately model the behavior of each passing vehicle. In particular, there is a problem that the simulation may be different from the actual one when the behavior of the vehicle is complicated in a construction section. In addition, Japanese Patent Application Laid-Open No. Hei 7-21490 discloses that traffic control using a temporary signal is an effective means in a situation where the traffic volume is small, but when traffic volume in a city area is relatively large, it is effective. There was a problem that application was difficult.

The present invention has been made in order to solve such problems, and it is possible to quantitatively grasp the occurrence of traffic congestion and the like, and to set an appropriate green time and a timing for signal switching in a construction section. It is another object of the present invention to provide a traffic simulation method in a road construction section that can achieve consistency in signal setting with a surrounding intersection.

[0005]

A traffic simulation method in a road construction section according to the present invention is a traffic simulation method for simulating traffic conditions in a peripheral road including the road construction section. Setting of road alignment and road shape, setting of traffic conditions, setting of control method and traffic signal at construction sections and intersections before and after construction sections, setting of vehicle motion performance for each vehicle type, reaction delay time when starting, turning right and left In addition, a determination criterion is set when changing a single line or a single line, and a simulation is performed in consideration of each set information.

Further, as a vehicle follow-up model in the simulation, X 'is the speed of the vehicle, X is the position of the vehicle,
Assuming that l and m are tracking parameters, α ₀ is a sensitivity parameter, and τ is a reaction delay, the acceleration X ″ of the following vehicle (n + 1) following the preceding vehicle n at time t + Δt is calculated by the following equation.
It is modeled by _{n + 1} (t).

[0007]

(Equation 2)

In addition, the following parameters l and m, the sensitivity parameter α ₀ , and the reaction delay τ are set based on actual traffic observation of a peripheral road including a road construction section.

[0009]

FIG. 1 is a block diagram showing a configuration of a traffic simulation system for implementing a traffic simulation method in a road construction section according to the present invention.
In the figure, 10 is an input data creation system, 20 is a simulation execution system, and 30 is an output data creation system. The input data creating system 10 includes a road network setting system 11, a traffic condition setting system 12, a traffic control setting system 13, a vehicle traveling setting system 14, and a driver behavior setting system 15.

The simulation execution system 20
Is composed of a reproduction mode 21, an optimization mode 22, and a parameter estimation mode 23. Based on the models and data set by the input data creation system 10, each Calculate vehicle acceleration, speed and position coordinates. Here, as the positional relationship of the car, there are two states of the leading car and the follower, as the longitudinal movement of the car, there are four states of constant speed, starting acceleration, braking deceleration, and stopping, and further as the lateral movement of the car. The three states of straight ahead, turning, and lane change are set, and the behavior of the vehicle is determined by a combination of the three states. The output data creation system 30 includes an evaluation index calculation system 31, a traffic situation reproduction animation system 32, and a virtual measurement data creation system 33.

The road construction section to be simulated by the traffic simulation method of this embodiment is as follows:
As shown in FIG. 2, the road is a two-lane road with one lane on each side and includes a construction section 41, a construction section traffic control signal 42, and a signalized intersection 43.

Next, the operation of each part of the traffic simulation system shown in FIG. 1 will be described. First, the road network setting system 11 sets a road alignment and a road shape such as a construction section length, a road width, or the number of lanes on a peripheral road including a construction section. In addition, traffic condition setting system 1
In step 2, traffic conditions such as traffic volume, large car mixing rate, right / left turn rate at an intersection, or headway distribution at an intersection are set. The traffic control setting system 13 sets a control method and a traffic signal at a construction section and at intersections before and after the construction section. Further, the vehicle traveling setting system 14 sets vehicle kinematics such as vehicle length, speed, acceleration / deceleration, and inter-vehicle distance for each vehicle type.

The following model of the vehicle is modeled by the acceleration X ″ _{n + 1} (t) at time t + Δt of the following vehicle (n + 1) following the preceding vehicle n, as shown in the following equation.

[0014]

(Equation 3)

Here, X 'represents a speed, and X represents a position. Also, l and m are tracking parameters, α ₀ is a sensitivity parameter, and τ is a reaction delay. Then, by setting these parameters by actual traffic observation, a highly accurate simulation is realized. Further, the driver behavior setting system 15 sets a reaction delay time at the time of starting or the like and a criterion at the time of turning right or left or changing a single line.

In the reproduction mode 21, a simulation is performed in accordance with the conditions set by the input data creation system 10. In the optimization mode 22, the green time in the construction section is optimized for the green time in the signalized intersection. In the parameter estimation mode 23, the parameters of the traffic flow model adapted to the actually measured traffic condition are estimated.

The evaluation index raising and lowering system 31 calculates typical evaluation indices usually used in traffic simulations such as the number of queues and the transit time, and the traffic situation reproduction animation system 32 displays the simulation results on a computer screen. The virtual measurement data creation system 33 displays an animation on the top, and virtually sets a vehicle sensor at an arbitrary point on the road to compare with actual measurement data or create new simulation input data. And get the average speed data.

Next, the simulation operation of this embodiment will be described. FIG. 3 is a flowchart showing the simulation operation of this embodiment. First,
Road network setting system 1 of input data creation system 10
1. After setting various input data by the traffic condition setting system 12, the traffic control setting system 13, the vehicle traveling setting system 14, and the driver behavior setting system 15, the simulation is executed by the simulation execution system 20.

First, a signal presentation at a certain time (time t) is determined (S10, S11), and it is determined whether or not a car is generated during the next Δt seconds (S12). If it is determined that the occurrence has occurred, the vehicle, the driver's specifications, and the exercise state are set (S13). Then, the speed and position of the vehicle at time t + Δt are calculated, and the following model is changed by changing the positional relationship of the vehicle (S14, S15).

Then, it is determined whether or not the vehicle involves a lane change or a right / left turn (S16). If it is determined in S16 that the vehicle involves a lane change or a right / left turn, the traveling data (motion trajectory) of the vehicle is obtained. It is set (S17).

At time t + .DELTA.t, it is determined whether or not the right to switch in the construction section is to be switched (S18).
If it is determined that the right of access is to be switched, a procedure for switching the right of access is performed (S19).

Then, it is determined whether or not a preset end time has been reached (S20). If it is determined in S20 that the end time has not been reached, Δt is added to the current time t.
It returns to S10. If it is determined in S20 that the end time has come, the simulation is ended, and various processes are performed by the output data creation system 30 based on the simulation result.

Here, a simulation operation for changing lanes will be described. FIG. 4 is a flowchart showing a simulation operation relating to lane change according to this embodiment. In FIG. 4, (a) of FIG. 4 shows a simulation operation for a lane change when a normal lane change is performed, and (b) of FIG. 4 shows a simulation operation for a lane change when an obstacle is present ahead.

First, in the case of a normal lane change, first, it is determined whether or not the lane can be changed (S30). If it is determined in S30 that the lane can be changed, there is a preceding vehicle. It is determined whether or not there is a preceding vehicle in S31. If it is determined in S31 that there is a preceding vehicle, it is determined whether or not the inter-vehicle distance is small (S31).
32).

If it is determined in S32 that the inter-vehicle distance is small, it is determined whether or not the speed difference from the preceding vehicle is large (S3).
3) If it is determined that the speed difference is large in S33, it is determined whether or not it is possible to interrupt the adjacent lane (S34). If it is determined that the interrupt is possible in S34, a lane change procedure is performed (S35), and the process is terminated. I do.

If there is an obstacle ahead,
It is determined whether it is possible to interrupt the adjacent lane (S40).
If it is determined in step 40 that the interrupt is possible, a lane change procedure is performed (S41), and the process ends. If it is determined in S40 that interruption is not possible, a deceleration procedure is performed (S42), and it is determined whether or not to stop (S43).

If it is determined in step S43 that the operation is not stopped, the process proceeds to step S4.
It returns to 0 and determines whether it is possible to interrupt the adjacent lane.
If it is determined in S43 to stop, a stop procedure is performed (S44), and the process ends.

In this embodiment, a road section setting system 11, a traffic condition setting system 12, a traffic control setting system 13, a vehicle traveling setting system 14, and a driver behavior setting system 15 of the input data creating system 10 determine a construction section. Construction section length, road width,
Or setting of road alignment such as the number of lanes, road shape, traffic conditions such as traffic volume, large car mixing rate, right / left turn rate at intersections, or headway distribution at intersections, at construction sections and intersections before and after construction sections Control system and signal settings, vehicle length, speed, acceleration / deceleration, inter-vehicle distance, and other vehicle dynamic performance settings for each vehicle type, reaction delay time for starting, etc., and judgment criteria for turning right and left or changing single track And simulation is performed, so that the traffic control method and the installation method of the construction section can be optimized, and traffic congestion due to the influence of road construction can be minimized. In addition, a highly reliable simulation can be performed by considering actual traffic data and signal intersections before and after the construction section.

[0029]

As described above, according to the present invention, setting of road alignment and road shape on surrounding roads including the road construction section, setting of traffic conditions, construction sections and intersections before and after the construction section are performed in advance. Setting of control method and traffic light,
The vehicle dynamics performance is set for each vehicle type, the reaction delay time when starting, the judgment criteria when turning right and left, and when changing a single track are set, and a simulation taking into account each set information is performed. The method and installation method of the construction section can be optimized, traffic congestion due to road construction can be minimized, and actual traffic data and signal intersections before and after the construction section are considered. This has the effect that a highly reliable simulation can be performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a traffic simulation system for implementing a traffic simulation method in a road construction section according to the present invention.

FIG. 2 is a diagram showing a road construction section in which a simulation of the embodiment is performed.

FIG. 3 is a flowchart illustrating a simulation operation according to the embodiment.

FIG. 4 is a flowchart illustrating a simulation operation related to lane change according to the embodiment;

[Explanation of symbols]

 Reference Signs List 10 input data creation system 11 road network setting system 12 traffic situation setting system 13 traffic control setting system 14 vehicle driving setting system 15 driver behavior setting system 20 simulation execution system 21 reproduction mode 22 optimization mode 23 parameter estimation mode 30 output data creation System 31 Evaluation index calculation system 32 Traffic situation reproduction animation system 33 Virtual measurement data creation system

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akihiko Kato 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Teruyuki Matsumoto 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Sun (72) Inventor Takashi Nakatsuji 8-chome Kita 13-Jo Nishi, Kita-ku, Sapporo City, Hokkaido

Claims (3)

[Claims] 1. A traffic simulation method for simulating a traffic condition on a peripheral road including a road construction section, comprising: setting a road alignment and a road shape on a peripheral road including the road construction section; setting traffic conditions; Set the control method and traffic signal at the intersection before and after the construction section, set the vehicle motion performance for each vehicle type, set the response delay time when starting, the judgment criteria when turning right and left or change the single track, and set each set A traffic simulation method in a road construction section, wherein a simulation is performed in consideration of information. 2. As a vehicle follow-up model in the simulation, X 'is the speed of the vehicle, X is the position of the vehicle,
Assuming that l and m are tracking parameters, α ₀ is a sensitivity parameter, and τ is a reaction delay, the acceleration X ″ of the following vehicle (n + 1) following the preceding vehicle n at time t + Δt is calculated by the following equation.
_2. The traffic simulation method in a road construction section according to claim 1, wherein modeling is performed by _{n + 1} (t). (Equation 1) 3. The road construction according to claim 2, wherein the following parameters l and m, the sensitivity parameter α ₀ , and the reaction delay τ are set based on actual traffic observation on a peripheral road including the road construction section. Traffic simulation method for the section.