Optimal allocation model of signalized intersections with dynamic use of exit lanes for left turn; [信控交叉口逆向可变车道最优分配模型]

In order to improve the operational efficiency of heavy left-turn demand intersections, an optimal allocation model of an intersection with dynamic use of exit lanes for left turns (EFL) is proposed. The constraints of setting EFL are analyzed, including the number and length of reverse variable lanes, flow direction constraints, and signal constraints, etc. The constraints and control variables are combined in a unified framework for simultaneous optimization. The objective functions are defined as the average delay and left-turn capacity of an intersection. The model is solved by a non-dominated genetic algorithm (NSGA-Ⅱ). The results show that after the optimal allocation of EFL, the average vehicle delays of the intersection can be reduced by 14.9% and left-turn capacity can be increased by 19.3%. The effectiveness of the optimal allocation model of EFL is demonstrated. © 2020, Editorial Department of Journal of Southeast University. All right reserved.