Expressway crest vertical curve road segment variable velocity-limiting control method

Abstract

The invention discloses an expressway crest vertical curve road segment variable velocity-limiting control method. A traffic flow detector is arranged on a downhill segment. A road-side variable information prompt board is arranged on an uphill segment. An optimal uphill speed limit value on an expressway crest vertical curve road segment is chosen through calculation to propagation velocity of traffic jam waves. Consequently, the expressway crest vertical curve road 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 crest vertical curve road segment, enables the driver to slow down to the safety vehicle speed in advance before the driver drives a vehicle into the expressway crest vertical curve road segment, thereby avoiding rear-end collisions caused by traffic jam on the downhill segment. The expressway crest vertical curve road 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 crest vertical curve road 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 convex vertical curve section of an expressway 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 convex vertical curve section of the expressway is often accompanied by the problem of poor sight distance. When the convex vertical curve section is congested on the downhill slope, the congestion position is often in the blind spot of the driver of the uphill vehicle, causing the driver to drive through the convex vertical curve of the expressway. Downhill congestion can only be found after the road section. At the same time, the downhill congestion of the convex vertical curve section will form a queue of vehicles and sp...

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Problems solved by technology

[0004] Purpose of the invention: Aiming at the problem of frequent rear-end collision accidents on the convex vertical curve section of the expressway due to the poor sight distance of uphill drivers who cannot perceive the traffic congestion on the downhill section when turning, the present invention is based on the traffic flow characteristics of the congestion wave propagation Design the optimal speed limit calculation algorithm, provide a variable speed limit control method for the convex vertical curve section of the expressway, which can automatically detect traffic congestion on the downhill section of the turn, and reduce the vehicle speed on the uphill section in advance through variable speed limit control. In order to prevent rear-end collision accidents caused by poor sight distance on the convex vertical curve section of the expressway, it is of great significance to improve the safety of vehicles on the expressway

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