逆向可变车道交叉口信号配时优化方法

为提升逆向可变车道交叉口通行效率，提出一种基于逆向可变车道交叉口信号配时优化方法.假设车辆到达服从泊松分布，基于逆向可变车道交叉口车流运行特征，构建了逆向可变车道交叉口通行能力和延误计算模型；以周期时长、主预信号控制、逆向可变车道长度及饱和度等为约束，交叉口通行能力最大和平均延误最小为目标，建立了交叉口信号配时双目标优化模型，采用模拟退火算法求解.选取南昌市某交叉口分析了其设置逆向可变车道后，在高、中、低流量及不同左转比例下的运行效果.结果表明，本文所提方法在不同流量下均能提高交叉口的通行能力并减少延误，且更适合高流量交叉口；当高流量交叉口左转比例大于 20%时，交叉口通行效率改善更加显著.

Signal Timing Optimization Method for Reverse Variable Lane Intersection

To improve the traffic efficiency of the intersection with reverse variable lanes, a signal optimization method based on reverse variable lanes is proposed. Assuming the vehicle arrival rate in each approach of the intersection is subjected to Poisson distribution, based on the traffic characteristics of the reverse variable lane intersection, the traffic capacity and delay calculation model of the reverse variable lane intersection are constructed. A two objective optimization model of signal timing was established to achieve the maximum capacity and minimum average delay of the intersection with the consideration of the constraints, such as cycle length, main and pre- signal control, reverse variable lane length, and saturation. And a simulated annealing algorithm was used to solve the problem. An intersection in Nanchang city is selected to analyze its operation effect under high, medium and low vehicle volumes and different left-turn ratios are analyzed after setting reverse variable lanes. The results show that the proposed method can improve the intersection capacity and reduce the delay under different vehicle volumes, and is more suitable for high-traffic intersections. The efficiency is more obvious when the left-turn ratio of high-flow intersection is more than 20%.