动态出口左转车道控制优化研究

Optimization Control of Dynamic Use of Exit-lanes for Left-turn Traffic

动态出口左转车道(EFL)设计现已应用于多个城市道路交叉口。为解决该类交叉口在实际运行过程中存在的车流量在各个车道分布不均衡,逆流车道在某些时段使用率不高等问题,对现有的EFL设计及交通控制方案进行改进。研究1种非常规的EFL设计以及动态出口车道灵活配置的方法,并对改进后动态出口左转车道的长度进行优化。基于此,研究驱动信号控制策略,建立非常规EFL设计下的延误计算模型。运用Matlab对常规、改进前、改进后这3种情况下的交叉口信号控制方案进行了对比分析。结果表明:当左转流量为400辆/h时常规交叉口最佳信号周期为130 s,同周期下改进后与常规、改进前的交叉口相比车均延误下降比例分别为39.68%和29.48%;当左转流量为500辆/h时常规交叉口最佳周期为174 s,同周期下改进后较常规、改进前的交叉口车均延误下降比例分别为12.90%和12.02%。

The design of dynamic use of exit-lanes for left-turn(EFL)traffic has been applied to many urban intersec⁃tions.The existing EFL design and traffic control schemes are improved to solve the problems of uneven distribution of traffic flow in different lanes and low utilization rate of countercurrent lane during certain periods.A new method of the dynamic EFL design and flexible configuration is proposed.Based on the optimized length of the improved dynam⁃ic EFL,a signal control strategy is proposed and a delay estimation model under the unconventional EFL design is al⁃so developed.Matlab is used to compare the signal control schemes under the three scenarios:conventional setup,be⁃fore,and after improvement.It is found that,when the left-turn flow is 400 vehicles/h,the best signal cycle of conven⁃tional intersections should be 130 s.Under the same signal cycle,compared with the conventional and the after-im⁃provement scenarios,the vehicle delay is found to decrease by 39.68%and 29.48%,respectively.It is also found that,when the left-turn flow reaches 500 vehicles/h,the optimal cycle of the conventional intersection is found to be 174 s.When compared with the conventional and the after-improvement scenarios,the vehicle delay is found to de⁃crease by 12.90%and 12.02%,respectively.