Expressway turning segment variable velocity-limiting control method

Abstract

The invention discloses an expressway turning segment variable velocity-limiting control method. A traffic flow detector is installed on the downstream of an expressway turning segment. A road-side variable information prompt board is installed on the upstream of the expressway turning segment. An optimal uphill speed limit value on an expressway turning segment is chosen through calculation to propagation velocity of traffic jam waves. Consequently, the expressway turning segment variable velocity-limiting control method achieves the purpose that a driver can carry out variable speed control on the condition that the driver has poor sight distance on the expressway turning segment, enables the driver to slow down to the safety vehicle speed in advance before the driver drives a vehicle into the expressway turning segment, thereby avoiding rear-end collisions caused by traffic jam on the downstream. The expressway turning segment variable velocity-limiting control method is attached to actual traffic flow characteristic, is easy and convenient to implement, and has wide engineering value and good application prospect in preventing the rear-end collisions on the condition that the driver has poor sight distance on the expressway turning segment.

Description

technical field [0001] The invention relates to traffic safety and intelligent traffic technology, in particular to a variable speed limit control method for a turning section of an express road that can prevent rear-end collision accidents. Background technique [0002] With the rapid increase in the mileage of expressways and the number of motor vehicles in my country, the situation of road traffic safety is becoming increasingly severe. The turning section of the expressway is often accompanied by the problem of poor sight distance. When there is congestion downstream of the turning section, the congestion position is often in the blind spot of the driver's sight of the upstream vehicle, so that the driver can only find the downstream congestion after driving through the turning section of the expressway. At the same time, the turning section The downstream congestion will form a queue of vehicles and spread to the upstream section, further reducing the distance between t...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In view of the poor sight distance of upstream drivers in the turning section of the expressway and the inability to perceive the traffic congestion in the downstream section of the turn, resulting in frequent rear-end collision accidents in the turning section of the expressway, the present invention designs the optimal speed limit based on the traffic flow characteristics of the congestion wave propagation The value calculation algorithm provides a variable speed limit control method for fast road turning sections, which can automatically detect traffic congestion in the downstream section of the turn, and reduce the vehicle speed in the upstream section of the turn through variable speed limit control in advance, thereby preventing fast road turns Rear-end collision accidents caused by poor line-of-sight on road sections are of great significance to improving the safety of vehicles on express roads

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