Fast road dynamic speed limit optimization control method in bad weather

Abstract

The invention provides a dynamic speed limit optimization control method to reduce secondary rear-end collisions in bad weather on a fast road. Traffic flow detection devices and meteorological monitoring devices are arranged on each section of the fast road to acquire traffic flow status and meteorological data. In the propagation process of congestion caused by traffic accidents in bad weather,a car-following model is used as the core algorithm to calculate the conditions of traffic accidents, so as to calculate and solve the optimal speed limit value of the upstream section. The speed limit value is issued through variable information signs on the roadside, so as to reduce secondary rear-end collisions. Compared with the prior method, the improved dynamic speed limit optimization control method provided by the invention considers the traffic flow operating status on the road and meteorological parameters such as visibility and road surface conditions at the same time; the calculated optimal speed limit value is accurate and reasonable; the climate and environmental conditions of the specific road can be considered; secondary rear-end collisions in bad weather can be effectivelyreduced; and the traffic safety of fast roads in China can be improved.

Description

technical field [0001] The invention belongs to the technical field of traffic safety and intelligent traffic, and in particular proposes a new real-time dynamic speed limit control method for reducing the risk of secondary accidents on expressways aimed at adverse weather conditions. Background technique [0002] With the continuous advancement of urbanization and motorization in our country, problems such as traffic congestion, energy consumption, and environmental pollution have gradually attracted people's attention. In recent years, traffic safety, as an important subject involving citizens' lives and properties, has become a hot topic of discussion and research. [0003] As a fast road control strategy, dynamic speed limit control is increasingly used to improve all aspects of road traffic safety. Traditionally, in order to ensure driving safety, the vehicle performs corresponding deceleration or braking operations by observing the distance from the vehicle in front d...

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Problems solved by technology

[0006] For the dynamic speed limit control method under bad weather conditions in the past, only a relatively fixed speed control scheme was used. After the improvement, only road geometry and meteorological data were considered, and the defect of real-time traffic flow status data was not included, and the resulting speed limit scheme Aiming at problems such as low conformity with actual roads and traffic conditions, poor safety control effect, etc., an optimized dynamic speed limit control method for expressway under adverse weather conditions is proposed

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