交通事故导致车辆被迫采取换道、减速等行为,严重影响路段的通行能力.为缓解交叉口处因事故导致的交通阻塞,有必要基于事故车道位置、与交叉口距离及事故规模等信息,分析事故前后交通流变化规律,从而进行交通影响研究,并制定满足交通需求的临时性信号配时方案.该研究借助实地调研事故数据,构建了宏观交通流仿真模型,以选定交叉口的交通量、平均车速、最大排队车辆数和平均延误作为优化目标,并通过SUMO(Simulation of Urban Mobility)仿真试验验证4种信号配时方案的有效性.最后,建立基于熵权-TOPSIS法的综合评估模型,对4种信号配时方案的效果进行综合评估.结果表明:事故发生位置、事故规模对交通运行的影响呈非线性变化;在4种信号配时方案中,方案2的整体优化效果最佳,事故方向交通量提升了11.76％,平均车速提升了16.37％,事故方向平均延误降低了12.59％,最大排队车辆数降低22.41％.
Traffic Accident Characteristics Analysis and Signal Control Optimization Design at the Intersection of Urban Roads
That traffic accidents cause lane changes and deceleration of vehicles significantly impact the traffic ca-pacity of the road.In order to alleviate congestion at intersections caused by accidents,based on information of the location of the accident lane,the distance from the intersection and the scale of the accident,it is necessary to ana-lyze the changes law of traffic flow characteristics before and after the accident to study traffic impact and make the temporary signal timing plans that meet traffic demand.Based on the field survey accident data,a macroscopic traf-fic flow simulation model was conducted to determine the traffic volume,average speed,the maximum queue vehicle number,and average delay at the selected intersection to serve as optimization objectives.The effectiveness of four signal timing plans was validated by Simulation of Urban Mobility(SUMO).And,the performance of the plans was comprehensive evaluated by the model based on the Entropy weight-TOPSIS method.The results indicate that the impact of the accident location and scale on traffic operations exhibits a nonlinear pattern;Among the four signal timing plans,Plan 2 demonstrated the best overall optimization effect,with a 11.76％improvement in traffic volume in the accident direction,a 16.37％increase in average speed,a 12.59％reduction of average delay,and a 22.41％decrease of the maximum queue length.
intersection of urban roadstraffic accidentsSUMOsignal timingcomprehensive assessment
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