考虑上游交叉口信号设计的排队长度计算

Queue Length Calculation Considering the Signal Design of Up-stream Intersection

排队长度是拥挤道路或短距离交叉口交通设计或信号控制重点考虑的交通评价指标之一.针对传统排队长度计算仅考虑单个交叉口交通运行参数的不足,构建了综合考虑上下游交叉口交通运行参数的排队长度计算模型.该模型以交通波理论为基础,综合考虑了上下游交叉口的信号设计、转向流量、路段长度,以及相位差等因素,通过各相位最大排队长度状态点的时空演化计算,得到了交叉口最大排队长度计算方法.经VISSIM和SYNCHRO等交通软件的对比分析表明,模型具有较高的计算精度,可定量分析上下游交叉口各交通要素对排队长度的影响,适用于关联交叉口的交通设计优化或拥挤路段的实时信号控制.

Queue length is the important evaluation index for traffic design or signal control of congestion road or short-link intersections.To overcome the demerit that the traditional queue length calculation method considers about the isolated intersection,a new queue length calculation model is built by taking into the up-stream and down-stream intersections consideration.The model is based on the traffic-wave theory,and it synthesized analyzes the main influential parameters of up-stream and down-stream intersections such as signal plans,movement volume,link length,signal difference,etc.To get the queue length calculation method,a time-spatial diagram is built describing the evolution of queue end point phase by phase.Through a case study comparing with VISSIM and SYNCHRO software,it is found that the model has a reliable calculation precision to reflect quantitatively the influence of traffic elements of up-stream and down-stream intersection which can be applied in the practice of traffic design and signal control optimization.