A variable speed limit control method for preventing rear-end collision accidents near tunnel entrances and exits

Abstract

A variable speed limit control method for preventing rear-end collision accidents near tunnel entrances and exits. Traffic flow detectors are installed downstream of tunnel entrances and exits to automatically obtain real-time traffic flow data to monitor traffic flow status; variable information prompts are set upstream of tunnel entrances and exits board; considering the characteristics of the rapid propagation of congestion to the upstream, calculating the occurrence conditions of rear-end collision accidents based on the propagation characteristics of congestion waves, and considering comprehensive factors such as visual adaptation time caused by strong changes in light when the driver enters and exits the tunnel entrance, the optimal limit is calculated. The speed value, through the variable information prompt board, reminds the vehicles entering and leaving from time to time, which overcomes the defect that the rear-end collision accidents near the tunnel entrance and exit cannot be actively prevented in the past, and greatly reduces the incidence of rear-end collision accidents near the tunnel entrance and exit, and the control method is simple and easy to implement. Has broad prospects.

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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