无信号交叉口支路车道通行能力建模与仿真

为了解决现有无信号交叉口支路通行能力模型的假设过于理想化与计算误差偏大的问题,针对无信号交叉口常见1车道与2车道支路的各种车道功能划分,基于可接受间隙理论与主路车头时距服从M3分布,分析了无信号交叉口支路大小车型构成混合车队的交通流运行特性,建立了各种支路功能划分车道的通行能力模型;利用Vissim交通仿真软件,对模型的可靠性进行检验,并对模型进行简化以加强实用性。研究表明:当主路车流量为600～1 000 veh/h时,该模型误差小于2%。

Lane Capacity Modeling and Simulating of Branch Road at Unsignalized Intersection

In order to solve the problem about what is over-idealization hypothesis and large error for existing lane capacity models of branch road at unsignalized intersection,as for the different functional lanes of branch road with one or two lanes,the traffic flow feature of platoon composed of minor-type and large-type vehicles in branch road is analyzed firstly,based on the gap acceptance theory and M3 distribution of main flow at unsignalized intersection.Then,the capacity models of different functional lanes of branch road are set up.Finally,Vissim traffic simulation software is used to test the reliability of the models,and the models are simplified to enhance their practicality.The study result shows that the models error is less than 2% when the traffic flow of main road belongs to 600-1,000 veh/h.