城市道路路段行人过街信号设置研究

现行规范对路段行人过街信号的设置条件缺少定量分析与理论依据,为保障路段行人过街安全,研究行人过街等待时间、行人安全度及行车延误对行人过街信号设置的影响。基于哈尔滨市某双向6车道主干路无信号人行横道的调查数据,分别构建行人过街等待时间与机动车流率、交通冲突时间与行驶速度、行车延误与过街行人流率的关系模型。以45 s作为过街行人忍受时间阈值,计算得到设置路段行人过街信号的机动车流率条件为1200辆·h-1;以1.3 s作为交通冲突时间阈值,得到对应的机动车行驶速度条件为55 km·h-1;以不同服务水平对应的行程车速为依据,给出设置路段行人过街信号的过街行人流率条件。

Setting Pedestrian Mid-block Crossing Signals on Urban Roadway

There lack quantitative analysis and theoretical basis for setting mid-block pedestrian crossing signals in existing specifications or manuals. Concerning the safety of pedestrian crossing, this paper inves-tigates the impacts of pedestrian waiting time, degree of pedestrian safety, and vehicular delay on the set-tings of mid-block pedestrian crossing signals. Based on the survey data at a un-signalized mid-block pe-destrian crossing on a six-lane arterial in Harbin, this paper develops a model that captures the interrela-tions among pedestrian waiting time and vehicular flow, traffic conflict time and driving speed, vehicular delay and pedestrian flow. Using 45 seconds as the threshold of pedestrian acceptable waiting time, this study concludes that mid-block pedestrian crossing signals should be set if vehicular flow is more than 1, 200 veh/h. Taking 1.3 seconds as the threshold of traffic conflict time, the paper finds that a driving speed at above 55 km/h warrants the setting of mid-block pedestrian crossing signals. Based on travel speeds cor-responding to different levels of service, the paper develops the pedestrian flow thresholds for setting of mid-block crossing signals.