Variable speed limit control method for preventing rear-end collision at tunnel entrance and tunnel exit

Abstract

The invention relates to a variable speed limit control method for preventing a rear-end collision at a tunnel entrance and a tunnel exit. Traffic flow detectors are arranged at the downstream positions of the tunnel entrance and the tunnel exit and real-time traffic flow data are automatically obtained from time to time to monitor the traffic flow state; variable information prompt boards are arranged on the upstream positions of the tunnel entrance and the tunnel exit. Based on the transmission feature of congestion waves, occurrence conditions of the rear-end collision are calculated by taking the feature that congestion can be rapidly transmitted to the upstream into consideration. The optimal speed limit value is calculated out by taking comprehensive factors into consideration. The comprehensive factors include the visual adaption time caused by variation of the light intensity when a driver enters or exits the tunnel. The variable information prompt boards are used for reminding entering vehicles and existing vehicles from time to time and the defect that initial precaution can not be executed for rear-end collisions at the tunnel entrance and the tunnel exit in the past is overcome. The occurrence rate of the rear-end collisions at the tunnel entrance and the tunnel exit is greatly reduced, the control method is simple and easy to achieve and the wide prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of intelligent transportation, in particular to a variable speed limit control method for preventing rear-end collision accidents near tunnel entrances and exits. Background technique [0002] With the rapid progress of my country's urbanization process and the increasing scale of cities, urban traffic problems have become increasingly severe. In order to meet the growing urban traffic needs, more and more long tunnels have been built within cities and between cities. At the entrance and exit of a long tunnel, it is often accompanied by a sharp change in light intensity. It takes a period of time and a distance for the driver's sight to adapt to the darker light in the tunnel or the stronger light outside the tunnel. During this period, the driver cannot see Clear the situation in the tunnel and keep moving forward at the same speed. Once the vehicle in front is congested and slows down, when the rear driver...

AI Technical Summary

Problems solved by technology

At the entrance and exit of a long tunnel, it is often accompanied by a sharp change in light intensity. It takes a period of time and a distance for the driver's sight to adapt to the darker light in the tunnel or the stronger light outside the tunnel. During this period, the driver cannot see Clear the situation in the tunnel and keep moving forward at the same speed. Once the vehicle in front is congested and slows down, when the rear driver finds out and slows down after the adaptation period, the distance between the vehicle behind and the congested vehicle in front is smaller than normal. When the distance is not enough When vehicles entering / exiting the tunnel complete the deceleration behavior, it is very easy to cause serious rear-end collision accidents

According to relevant researches, the human eye needs the physiological process of dark adaptation or light adaptation when the light changes rapidly, so the visual adaptation period at the entrance and exit of the long tunnel to the sudden change of light increases the risk of rear-end collision accidents

[0003] At present, my country has set a static speed limit value at the tunnel entrance and exit that is suitable for normal driving conditions, lacks the detection of special traffic conditions such as congestion in the tunnel, and lacks the propagation characteristics of congestion waves in the process of determining the speed limit value of the tunnel entrance and exit. These technical defects shorten the distance for drivers of vehicles entering and exiting the tunnel to decelerate after discovering congestion, thus increasing the probability and severity of rear-end collision accidents at the entrance and exit of long tunnels

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