雨雾天气下公路可变限速控制策略研究

Variable speed limit control strategy for highway under rainy and foggy weather

摘要:

针对雨雾天气下公路交通事故上升与通行能力下降的问题,综合考虑交通安全和通行效率两个因素,提出一种雨雾天气下可变限速控制策略。首先,考虑雨雾天气下道路线形对车辆速度和道路通行能力的影响,建立雨雾天气下动态交通流模型。然后,根据驾驶员可视距离、路面附着系数和道路曲线等因素确定雨雾天气下车辆最大安全速度。最后,采用自适应遗传算法对包含总行程时间和总行驶里程的目标函数进行求解,得到雨雾天气下各路段的限速值。仿真结果表明,所提出的可变限速控制策略有效降低了雨雾天气下公路的行车风险,并缓解了交通拥堵。

关键词:雨雾天气;可变限速控制;动态交通流模型;遗传算法

Abstract:

The rainy and foggy weather causes the increasing traffic accident and decreasing traffic capacity. In this paper, a variable speed limit control strategy in rainy and foggy weather is proposed by taking the traffic safety and traffic efficiency into consideration. Firstly, considering the influence of road alignment on vehicle speed and road capacity in rainy and foggy weather, the dynamic traffic flow model is established. Then, the maximum safe speed is determined according to drivers" visual distance, road adhesion coefficient and road curve. Finally, adaptive genetic algorithm is used to solve the objective function including total travel time and total mileage, and the speed limit value of each section in rainy and foggy weather is obtained. The simulation results show that the proposed variable speed limit strategy can effectively reduce the traffic risk and traffic congestion in rainy and foggy weather.

Key words:rainy and foggy weather; variable speed limit control strategy; dynamic traffic flow model; genetic algorithm