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《Journal of Transportation Systems Engineering and Information Technology》 2016-01
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Variable Speed Limit on Freeway Based on the Cost of Traffic Delay and Crash Damage

WANG Lei;LIN Yong-jie;School of Highway Engineering,Chang'an University;Department of Civil and Environmental Engineering,Northwestern University;  
Taking traffic volume and speed collected by traffic detection system as input variables, this paper proposes three kinds of step-by-step variable speed limit control models to minimize estimated delay cost, crash cost and comprehensive cost, respectively. The freeway crash rate is estimated based on volumeover- capacity and speed deviation by the existing model, and then the comprehensive cost is computed in terms of estimated delay and crash rate. In tests that used field freeway from about 20 km segment of Qinglan freeway with eight variable speed limit signs, these developed three controls show promise in reducing the numbers of vehicle stops, stopped delay and equivalent travel delay based on micro simulation results,smoothing traffic speed and improving traffic safety. Nevertheless, travel time of freeway vehicles is increased a little. Additionally, sensitivity analysis of driver compliance rate indicates that benefits of variable speed limit are gradually reduced as compliance rate decreased. When the compliance rate is below80%, benefits are significantly decreased; and benefits are essentially unchanged if it is less than a threshold of 60%.
【Fund】: 国家留学基金委项目([2014]3026);; 国家自然科学基金(51308335)~~
【CateGory Index】: U491.54
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