基于车道控制的交叉口流向及信号组合优化模型

Lane based integrated model of movement prohibition and signal control for intersections

为了提升城市道路交叉口运行效益,提出将流向禁止与信号控制相结合的交叉口优化模型。采用组合优化的方法,将禁止流向选择、车道功能、路段掉头位置以及信号配时等优化变量整合在一个统一的模型中,同步进行优化。该优化模型由混合整数非线性规划描述,并将其转换为一系列混合整数线性规划,采用分支定界法求解。通过算例及仿真分析,验证模型的效益。研究结果表明,禁止流向的选择对于交叉口运行效益有着很大影响,优化模型可根据交叉口几何及交通需求条件生成最优方案。尤其当常规交叉口无法满足交通需求时,该优化方法可提高通行能力达25%。

In order to enhance the operation efficiency of unban street intersections, this paper presented an optimization mo- del which combined the movement prohibition strategy and signal control. Based on the integrated design method, all the con- trol variables such as the prohibited movements, lane assignment, median crossover location, and combined signal timings in a unified framework and optimized simultaneously. It could be described by a mixed-integer non-linear programming model. It transformed the problem into a series of mixed-integer linear programming problems which could be efficiently solved by the standard branch-and-bound technique. It tested the effectiveness of the proposed model by numerical and simulation analysis. Results show that the selection of the prohibited movement effects the performance of the intersection greatly. The proposed model can produce the optimal design according to the traffic geometric and demand conditions. The capacity improvement can reach 25% when the conventional design can not accommodate the traffic demand.