Method for adjusting traffic flow by controlling traffic lights

Abstract

The invention discloses a control method for adjusting traffic flow, and particularly relates to a method for adjusting traffic flow by controlling traffic lights. The method specifically comprises the following steps: installing a speed measuring device in the direction away from the crossroad, measuring the speed of a vehicle in a speed measuring range away from the crossroad by a certain distance, setting a speed reference value, triggering a control signal when the speed is smaller than or equal to the speed reference value, transmitting the control signal to a signal controller, switching a signal lamp to be red, and controlling the traffic light to be red. And when the vehicle speed in the speed measurement range is greater than the speed reference value, the normal operation state of the signal lamp is recovered. The device has the characteristics of low equipment investment cost, manpower resource saving after application, and good effect of avoiding the blocking phenomenon at the crossroad.

Description

Technical Field

[0001] The present invention relates to a control method for regulating traffic flow, and more particularly to a method for regulating traffic flow by controlling traffic lights. Background Art

[0002] At present, traffic lights are installed at almost every crossroads (hereinafter referred to as intersections) on urban roads. By periodically alternating the traffic lights, vehicles in each direction take turns passing through the intersection, which solves the traffic jam problem at most intersections. However, during peak traffic hours or when a vehicle accident occurs, there will be a problem that some vehicles enter the intersection when the traffic light is green, but still cannot leave the intersection and remain in the intersection when the traffic light switches to red. At the same time, vehicles in the other direction with a green light also enter the intersection, causing the vehicles in each direction to be intertwined and congested in the intersection, forming a congestion phenomenon.

[0003] The key reason for the above phenomenon is that the existing signal lights can only switch signals periodically according to the pre-set fixed time, and cannot adjust the signals in a timely manner according to the road conditions to stop the vehicles in the green light direction that can no longer pass through the intersection outside the intersection. To solve this problem and prevent traffic jams at intersections, traffic police will increase the police force in advance at intersections with heavy traffic during morning and evening peak traffic hours or when a vehicle accident occurs for manual guidance, which wastes human resources. Even if the police force is increased, the congestion at intersections cannot be completely prevented. After all, the police force is limited and cannot be deployed at every intersection. Moreover, there are other situations that may cause traffic jams besides peak hours. Summary of the Invention

[0004] The present invention is to solve the above technical problems, and provides a method for regulating traffic flow by controlling traffic lights, which has the characteristics of low equipment investment cost, saving human resources after application, and good effect of avoiding traffic jams at intersections.

[0005] To solve the above technical problems, the present invention is realized by the following technical solutions: A method for regulating traffic flow by controlling traffic lights is as follows: Install a speed measurement device in the direction of leaving the intersection to measure the speed of vehicles within a certain distance from the intersection. Set a speed reference value. When the speed is less than or equal to the speed reference value, a control signal is triggered. The control signal is transmitted to the signal controller to switch the traffic light to red. When the speed of the vehicles within the speed measurement range is greater than the speed reference value, the normal operation state of the traffic light is restored.

[0006] Preferably, the speed measurement device is installed at the traffic light in the direction of leaving the crossroads to measure the driving speed of the vehicles within the speed measurement range of leaving the intersection.

[0007] Preferably, one speed measuring device is installed in each direction of vehicle travel, and the speed measuring device adopts a speed measuring camera.

[0008] By adopting the above technical solution, the present invention can achieve the following technical effects: It has the characteristics of low equipment investment cost, saving human resources after application, and good effect of avoiding congestion at intersections.

[0009] The present invention is based on the existing signal system, and a speed measuring device is added to assist in controlling the signal. By monitoring the speed of vehicles on the road, possible traffic jams can be predicted and the signal can be adjusted in time, thereby avoiding the above-mentioned traffic jams at the intersection. Implementation

[0010] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0011] A method for regulating vehicle flow by controlling traffic lights. Taking the road from north to south at an east-west or north-south intersection as an example, a speed measuring device is installed on the south side of the intersection. The speed measuring device can be installed at the traffic light. The speed measuring range is 30 meters to 45 meters away from the traffic light on the south side of the intersection in the direction of travel and 6 meters wide. The speed measuring range is not drawn on the road surface, but is marked on the screen of the speed measuring device. If the normal driving speed of the road section is 60 kilometers per hour, a speed reference value of 5 kilometers per hour is set. When the vehicle speed is lower than the reference value, it means that the vehicle on the road south of the intersection has After saturation, if the signal cannot be switched in time and the vehicles on the north side of the intersection continue to enter, it is possible that when the current signal cycle is switched, the subsequent vehicles cannot completely pass through the intersection and stay in the intersection, forming a traffic jam. The measuring device measures the speed of the vehicles within the speed measurement range. When the speed of more than 70% of the vehicles in the speed measurement range is lower than the reference value, the control signal is triggered. The control signal is transmitted to the signal controller, and the signal light is switched to red, so that the subsequent vehicles stop at the north side of the intersection. When the speed of more than 70% of the vehicles in the speed measurement range is greater than the reference value, if the current signal cycle has not ended, the switching signal is controlled to become green and the vehicle is released. Figuratively speaking, a pause button is installed in a signal cycle. This speed measuring device only controls the signal from north to south, and does not control the signal lights from south to north and east and west. That is to say, the other three directions still operate according to the normal signal cycle. The left turn direction will not be repeated here, and it can be set according to this method. Speed measuring devices are installed in all four directions, one for each vehicle driving direction, which can well solve the problem of traffic jams at the intersection.

[0012] The speed measurement range, such as the distance south of the intersection, the size of the area, and the speed reference value, need to be determined according to the on-site situation. This requires the years of experience of the traffic police department and the specific situation of the traffic flow on the road, and will not be described in detail here.

[0013] Now, speed measurement devices have been widely used in road speed measurement. For example, speed cameras are installed on highways and in urban areas. Connecting the speed measurement value trigger signal to the equipment (such as PLC) in the signal control box to control the signal light switching can also be achieved without creative labor.

Claims

1. A method for regulating traffic flow by controlling traffic lights, characterized in that The details are as follows: Install a speed measurement device in the direction of leaving the crossroads to measure the speed of vehicles within a certain distance from the crossroads within the speed measurement range. Set a speed reference value. When the speed is less than or equal to the speed reference value, trigger a control signal. The control signal is transmitted to the signal controller to switch the signal light to red. When the speed of the vehicle within the speed measurement range is greater than the speed reference value, restore the normal operation state of the signal light.

2. The method for regulating traffic flow by controlling traffic lights according to claim 1, characterized in that The described speed measurement device is installed at the traffic signal in the direction of leaving the crossroads to measure the driving speed of vehicles within the speed measurement range of leaving the intersection.

3. A method for regulating traffic flow by controlling traffic lights according to claim 1, characterized in that One speed measurement device is installed in each vehicle driving direction, and the speed measurement device uses a speed measurement camera.