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Modelling and Evaluation of Traffic Flow with Variable Speed Limit on Highway  

Cho, Hye-Rim (서울시립대학교 교통공학과)
Kim, Young-Chan (서울시립대학교 교통공학과)
Ha, Dong-Ik (인트라스)
Publication Information
The Journal of The Korea Institute of Intelligent Transport Systems / v.10, no.1, 2011 , pp. 16-26 More about this Journal
Abstract
Variable speed limit(VSL) is one of the highway ITS techniques designed to prevent accidents and traffic slow down by reducing congestion or speed variation between vehicles and lanes prior to arrive at the accident location by limiting speed. In Korea, while people have recognized the need for variable speed limit beginning with Seoul's urban expressway and installed facilities in order to provide guide for speed limit per lane and lane use, there has not been enough development of algorithm for internal administration as well as research on the basic principles behind administering variable speed limit. This study is for modeling and evaluating the VSL strategies based on the traffic flow theory. Supply-Demand method of the Cell Transmission Model is applied to demonstrate the traffic features and shockwaves to upstream of the bottleneck with/without VSL. We verified the explanation of Cell Transmission Model for the numerical example. and as the result, it is found that VSL strategies can reduce the total travel time in the congested section and variation of the speed. It means VSL is useful to improve the traffic condition and the safety on highway
Keywords
Variable speed limit(VSL); cell transmission model; supply-demand method; freeway management;
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