基于两种非传统交叉口通行能力的综合优化模型

An Integrated Capacity Optimization Model Based on Two Unconventional Intersections

为了降低传统交叉口左转车流对通行能力产生的影响,给解决交叉口运行效率低的问题提供新的思路,考虑连续流交叉口和上游信号交叉口两种非传统交叉口几何上的相似性,通过0-1变量建立了统一的线性规划模型。该模型同时考虑信号配时和车道分配,通过优化信号配时和车道分配方案提高交叉口的通行能力。给出了优化过程及结果,并在需求对称和不对称两种情况下对其进行了灵敏度分析。结果表明:不论需求对称与否,非传统交叉口均能明显提高交叉口的通行能力。

In order to reduce the influence of left-turn movements on the capacity of traditional intersections and provide a new way to solve the problem of low efficiency of the intersections, a unified linear programming model is established through a binary variable considering the geometric similarity between 2unconventional intersections,continuous flow intersection and upstream signalized crossover intersection.Both signal timing and lane assignment are considered in the model,and the capacity of the intersections is increased by optimizing signal timing and lane allocation scheme. The optimization process and the result are shown,and the sensitivity analysis of 2 scenarios which are balanced and unbalanced traffic conditions are conducted. The result indicates that both unconventional intersections can significantly increase the capacity under the 2 scenarios.