Variable speed limit control method for highway under dense fog

Authors

SUN Jiancheng, School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, ChinaFollow
QIAO Jiaxing, School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China

Abstract

In order to solve the problem of traffic safety on expressways under dense fog and change the original fixed speed limit measures, a variable speed limit control method based on the safe allowable speed was proposed. The speed limit value was calculated based on the regulations in road traffic safety law on the speed under dense fog by considering that the traffic law does not mention the road alignment conditions, road conditions, and other factors, and the monitor data was used to approximate replace the data of individual vehicles for data optimization, and the safe speed and safe distance of vehicles under dense fog were obtained. Based on this information, the paper provided a basis for setting dynamic variable speed limit information board and further determined the control flow of variable speed limit. The simulation test results of VISSIM show that compared with the fixed speed limit control, the minimum average speed of the variable speed control section is increased by 12.16%, and the maximum difference of average speed is decreased by 26.37%. Compared with the traditional fixed speed limit method, the variable speed limit control method can effectively guarantee travel safety and improve travel efficiency on expressways under dense fog.

Publication Date

3-17-2023

DOI

10.14048/j.issn.1671-2579.2023.01.043

First Page

240

Last Page

246

Submission Date

March 2025

Recommended Citation

Jiancheng, SUN and Jiaxing, QIAO (2023) "Variable speed limit control method for highway under dense fog," Journal of China & Foreign Highway: Vol. 43: Iss. 1, Article 87.
DOI: 10.14048/j.issn.1671-2579.2023.01.043
Available at: https://zwgl1980.csust.edu.cn/journal/vol43/iss1/87