考虑逆向可变车道的预信号公交优先控制

Transit priority control based on presignal and contraflow left-turn lane

为提高交叉口公交车辆通行效率,提出一种考虑逆向可变车道的预信号公交优先控制方法。假设车辆到达服从均匀分布,基于车流组织规则,构建交叉口车均延误计算模型,再以交叉口人均延误最小为目标,考虑周期时长、饱和度、主预信号控制、功能路段长度等约束,建立信号配时优化模型,最后采用模拟退火算法求解。算例分析结果显示:在交叉口饱和度为0.85的条件下,与常规交叉口、串联交叉口相比,本方法可有效降低人均延误并提高通行能力。通过敏感性分析得出:随着车辆到达率增加,本方法降低人均延误的效果越明显;当直行公交在同向车流中占比25%~35%或左转公交在同向车流中占比15%~25%时,应用本方法效果更好;实际应用中,综合待行区、渐变段等功能路段长度宜取最小临界值。

A transit priority control method of analyzing presignal and contraflow left-turn lanes was developed in this study to improve the bus traffic efficiency at isolated intersections.It was assumed that the vehicle arrival rate using each approach method was uniformly distributed,and the intersection delay calculation model was constructed based on car flow organization.The signal timing optimization model was established to achieve the minimum average person delay of the intersection that reflects the constraints,such as cycle length,saturation,main and presignal control,and functional section length.A simulated annealing algorithm was used to solve the model.The numerical example provided in this paper verifies the effectiveness of the proposed method.At an intersection saturation of 0.85,the proposed method can effectively reduce the average person delay of intersection and improve the traffic capacity compared to the conventional intersection and tandem intersection methods.Based on the sensitivity analysis results,the proposed method significantly decreased the average person delay with an increase in the vehicle arrival rate.In addition,it also performed better when the proportions of the through bus and leftturn bus were 25%~35%and 15%~25%,respectively.In practical applications,the length of the functional sections,such as the comprehensive waiting area and the transition section at the entrance,should be adopted as the minimum critical value.