信号交叉口短右车道通行能力概率模型

Probabilistic Model of Capacity of Short Right-turn Lanes at Signalized Intersections

在交叉口设计中,部分信号交叉口共用车道的进口道部分会拓宽形成短车道,由于短车道长度的限制,存在因车辆排队溢出而造成阻塞的问题.本文考虑了交通流的概率特性,分析了短车道排队阻塞对信号交叉口通行能力的影响,以短右车道为例,建立了基于概率论的短车道通行能力计算模型.然后,建立VISSIM仿真模型,通过典型算例对本文模型、HCM方法及仿真模型的输出结果进行比较,验证模型的准确性和有效性.进而讨论了直行车辆比重对通行能力的影响,以及短车道长度、机动车流量对短右车道交叉口车辆延误的影响.该模型对于准确计算信号交叉口短右车道通行能力有借鉴意义.

In the design of intersections, some imported lanes are widened into short lanes. Since the limited length of short lanes, there occurs the potential effect of queue blockage. This paper takes into account of the stochastic nature of traffic flow and the effect of queue blockage to the short right-turn lane. A case study in short right-turn lane, this paper develops a mathematical model to estimate the capacity of a signalized intersection approach with a short right-turn lane. Then, a V1SSIM simulation model is founded. According to the comnarison of the mathematical model, the HCM method and the VISSIM simulation model, the accuracy and adaptability of the mathematical model are verified. Further, the impact of the proportion of through traffic on capacity is investigated, the impact of the length of short lanes and the flow rate on vehicle delay are analyzed. This model has reference significance for accurate calculation of capacity of short right-turn lanes at signalized intersections.