高速公路瓶颈区域可变限速控制方法

Variable Speed Limit Control Method for Freeway Bottleneck Area

高速公路交通流处于高峰时,公路主线路段可能出现拥挤的瓶颈路段,导致车辆运行时间增加,路段运行效率降低等问题.本文从高速公路瓶颈区域路段交通流运行的时空特征出发,对现有的Papageorgiou模型进行扩展并考虑速度控制因素,使其适用于可变限速控制环境下的真实交通流运行状态,提出了适用于高速公路瓶颈区域的可变限速控制条件的改进模型,以控制周期内总通行量最大和车辆总行程时间最小为目标,建立高速公路主线可变限速控制优化模型.仿真结果表明,相对于固定限速控制,本文提出的可变限速控制方法可降低总行程时间7.45%,提高平均速度8.78%,表明该可变限速控制模型能在一定程度上缓解高速公路瓶颈区域的拥堵问题.

When freeway traffic in the peak period, the main freeway sections may appear crowded bottleneck sections, resulting in increased vehicle uptime and lower sections of the freeway main line operating efficiency and other issues. Based on the space-time characteristics of traffic flow in the bottleneck area section of freeway, the paper extends the existing Papageorgiou model and considers the speed control factors to make it suitable for the real traffic flow operation under the variable speed control environment. An improved model of variable speed control conditions in the bottleneck area of freeway is set up to optimize the variable speed control of freeway main line with the aim of maximizing the total traffic volume and minimizing the total vehicle travel time in the cycle. Simulation results show that, relative to the fixed speed control, variable speed control method proposed article can reduce the total travel time of 7.45%, raising the average rate of 8.78%, indicating that the variable speed control model can alleviate to some extent on the freeway bottleneck area congestion problem.