面向混合交通的感应式交通信号控制方法

Traffic signal actuated control at isolated intersections for heterogeneous traffic

为解决城市道路混合交通场景中,依据机动车交通流进行信号配时的设计方法无法兼顾非机动车交通流,且可能降低机动车交通流运行效率的问题,提出了以单点优化方法以及感应控制原理为基础的面向混合交通的感应式交通信号控制方法。在实施感应控制流程之前,根据热成像检测器的实时数据,结合以交通强度为核心指标的单点优化方法确定各相位的基准绿灯时间;在基准绿灯时间的基础上,确定各相位的初始绿灯时间以及最大绿灯时间,作为感应控制阶段的关键参数。用实际数据对本文方法进行合理性分析,结果表明混合交通中非机动车流对交通状态具有一定的影响,可以通过考虑非机动车的影响确定感应控制中的关键参数。此外,还通过算例设计对所提混合交通强度指标进行了脱机验证,结果表明:考虑非机动车影响的混合交通强度指标较原有交通强度指标能够更好地反映交叉口状态,使单点优化控制下的交叉口车均延误下降了7. 69%;根据混合交通强度计算得到的感应控制的最大绿灯时间,可使调查路段的过饱和周期比例下降80. 77%。

In heterogeneous traffic conditions,the designs of signal timings were based on motor traffic flows in most traditional signal control methods,which may reduce the motor vehicles’operating efficiencies and hinder the traffic engineers from finding the optimal signal timings.Therefore,a traffic signal actuated control method for heterogeneous traffic was proposed,which targets on motor and non-motorized vehicle traffic flows at isolated intersections.This method combined an optimization algorithm and an actuated control logic.The basic green time of each phase was optimized according to the real-time data obtained from the heat-imaging traffic detectors.Then,the initial green time and the maximum green time of each phase,the key parameters of the actuated control,were formulated as the expansions of the basic green time.The method was evaluated using field data,and the rationality analysis shows that the non-motorized vehicles in heterogeneous traffic have an influence on the traffic flows.In addition,an offline verification was designed,and the results show that the average vehicle delay is reduced by 7.69%when considering the non-motor vehicles in the optimization algorithm,while the proportion of oversaturated cycles is decreased by 80.77%under the actuated control.