关键交叉口与双周期交叉口间路段上的车辆排队模式及测算方法

为了描述周期时长不相等的协调信号交叉口间路段上车辆排队的集结与消散现象，以关键交叉口周期时长为双周期交叉口周期时长的2倍为例，基于冲击波理论，针对两个相邻交叉口之间路段上的上、下行车流分别描述了车辆排队的各种模式并建立了车辆排队长度模型。为了验证模型的有效性，利用VISSIM交通仿真软件设计了模拟实验方案。考虑不同条件下信号红时差与交通流率的多种组合，通过仿真实验共得到35组数据，每组数据均获得84个有效数据点。结果显示，上、下行方向的车辆排队消散长度的计算值与模拟值的相对误差小于10%的周期分别占75.56%和95.00%；交叉口信号周期越长，其排队消散长度的平均值和最大值也相应地越长。研究结果表明，该模型可以用来估算周期时长不相等的协调信号交叉口间路段上车辆的排队长度，从而为交通控制方案的优化与调整提供理论依据。

Vehicle queuing mode and its measurement on the sections between key and double-cycle intersections

We stated various modes of vehicle queuing and constructed a vehicle queue length model based on shock wave theory for upstream and downstream traffic flows between two adjacent intersections to describe vehicle queue growth and dissipation between signalized intersections with different cycles, taking the key intersection of twice cycles of double cycle intersection as an example. We also designed a simulation scheme with traffic simulation software VISSIM to validate the effectiveness of the model. 35 groups of data were obtained through simulation, each of which included 84 valid data by many combinations of signal red time difference and traffic flow rate under different conditions. Results show that the number of signal cycles whose relative error between the simulated and calculated values of queue dissipation length is less than 10% accounts for 75.56% and 95.00% for upstream and downstream traffic flows. The longer the cycle length at a signalized intersection is, the longer the average and maximum queue dissipation lengths are. Research results demonstrate that the model can be applied to the estimation of the queue length between signalized intersections with different cycles. The model can therefore provide a scientific basis for the optimization and adjustment of a traffic control scheme.