基于元胞传输模型的雨天高速公路可变限速方法

可变限速控制可减小降雨导致的高速公路交通拥堵和事故风险.提出雨天高 速公路可变限速控制策略，对经典的元胞传输模型进行改进，构建适用于雨天可变限速 控制问题的高速公路动态交通流模型；在综合考虑交通安全和效率基础上，建立雨天环 境下高速公路可变限速控制方法和模型.实验结果表明，与固定限速相比，雨天可变限速 控制下高速公路平均速度增加了9.3%，车辆总行驶时间减少了11.7%，相邻路段最大车 速差从17.5 km/h 减小为9.4 km/h，降幅达46.3%，有效地提高雨天环境下高速公路通行效 率和安全性.

Variable Speed Limits for Freeway under Rain Weather Based on Cell Transmission Model

Variable speed limits can decrease traffic congestion and accident risk due to rainfall. For rain weather, the control strategy of variable speed limits system are described; the classic Cell Transmission Model is improved, and dynamic traffic flow models for rain weather are proposed; optimization models of variable speed limits for rainfall are presented, considering both traffic safety and efficiency. Experiment results show that, comparing with static speed limit, freeway average speed increased by 9.3%, total travel time decreased by 11.7%, and the maximum speed difference between adjacent sections decreased from 17.5 km/h to 9.4 km/h by 46.3%.The results mean that variable speed limits can improve freeway traffic efficiency and safety under rain weather.