基于交通参与者延误分析的环形交叉口行人过街信号设置条件

Setting Conditions of Pedestrian Crossing Signals at Roundabouts Based on Traffic Participant Delay

为提升环形交叉口运行效率和安全水平,提出兼顾环岛行人和机动车需求的行人过街信号设置条件。首先,在交叉口饱和度等约束条件下,引入机动车让行率,运用交通流理论建立环岛机动车乘客及过街行人延误模型,以交通参与者总延误为指标提出行人过街信号设置条件;然后,基于视频调查数据使用回归分析方法预测人车交互次数,标定模型各项参数,并通过数值仿真分析不同机动车和行人流量对交通参与者总延误增量的影响;最后,选取哈尔滨市迎宾路-腾达大街环形交叉口作为案例进行模型验证与仿真比较。结果表明:行人流量不变时,机动车流量越大,设置行人过街信号后总延误增量越小;在机动车让行率较高的环岛,行人过街信号的设置对机动车和行人流量的要求较低;与实测数据相比,在符合条件的环岛设置行人过街信号后行人和机动车通过量增加,并且交通参与者总延误降低了23.3%。

In order to improve the operational efficiency and safety at roundabouts,the setting conditions of pedestrian crossing signals that take into account the needs of both pedestrians and vehicles were proposed.Firstly,under the saturation constraints,the vehicle yield rate was introduced to establish models of vehicle passenger and pedestrian delay by using traffic flow theory.Taking the total delay of traffic participants as an indicator,the pedestrian crossing signal setting conditions were proposed.Secondly,based on video survey data,the number of pedestrian-vehicle interactions was predicted through regression analysis,and the model parameters were calibrated.The impact of different vehicle and pedestrian flows on the total delay of traffic participants was analyzed through numerical simulation.Finally,Yingbin Road-Tengda Street roundabout in Harbin was selected as a case study for model validation and simulation comparison.The results showed that under the same condition of pedestrian flow,the larger the vehicle flow,the smaller the total delay increment after setting pedestrian crossing signal.At roundabouts with high vehicle yielding rates,pedestrian crossing signals were less demanding on vehicle and pedestrian flows.Setting pedestrian crossing signals at eligible roundabout,the pedestrian and vehicle throughput increased,and the total delay of traffic participants decreased by 23.3%compared with the measured data.