用于估计信号交叉口行人延误的微观仿真系统

Microsimulation System for Estimating Pedestrian Delays at Signalized Intersections

针对发展中城市中由定周期两相位交通灯控制的交叉口,建立了用于估计行人延误的微观仿真系统。信号灯周期被划分为一系列分相位,每个分相位持续1s。仿真系统包括车辆发生器、行人发生器、行人模型、统计模块等。其中,车辆发生器用于估算各分相位穿越人行横道的车流率,进而产生车辆序列;行人发生器用于产生到达人行横道的行人序列;行人模型包含若干行人行为规则;统计模块用于统计各分相位到达行人的平均延误,以及总的行人平均延误。最后,微观仿真系统用采集自西安市一个信号交叉口的数据进行了验证,结果表明它能比较准确地估计行人延误。

A microsimulation system is proposed to estimate pedestrian delays at signalized intersections adopting pre-timed two-phase control in developing cities, The signal cycle is divided into a series of subphases, and each subphase lasts 1 second. The microsimulation system includes vehicle generator, pedestrian generator, pedestrian model, and statistical module. Vehicle generator is used to estimate the flow rate of vehicles crossing crosswalks for each subphase, and then generate vehicle sequences; pedestrian generator is used to generate pedestrian sequences arriving at crosswalks; pedestrian model includes a set of behavior rules; and statistical module calculates the average delay of pedestrians arriving during each subphase, and the overall average delay. Finally, the microsimulation system is validated using the field data collected from a signalized intersection in Xi＇an, and the results indicate that it is able to estimate pedestrian delays accurately.