基于实测数据的排阵式交叉口饱和流率修正[1]

郑喆，马万经，王玲

同济大学道路与交通工程教育部重点实验室，上海 201804

【摘要】为了更为准确地计算排阵式信号交叉口饱和流率，在实测数据的支持下，建立了排阵式信号交叉口饱和流率修正模型。首先，采用视频录像对深圳市前海路排阵式控制区进行数据采集与对比分析，论证了排阵式控制对排序区内各条车道饱和流率存在影响。在此基础上，运用因素分析法，分别从驾驶员非熟悉操作、排序区车道利用及排序区车辆滞留三个方面对其影响进行了分析，并运用概率论及数理统计，建立了排阵式控制对饱和流率影响的修正模型。研究表明：排阵式控制虽然可通过动态的车道功能设置提高交叉口整体通行能力，但对进口车道饱和流率将造成一定负面影响，其中排序区车道的不均匀利用是排阵式控制对饱和流率影响的最主要因素，降低饱和流率约15.32%；驾驶员非熟悉操作违规进入排序区会导致阻塞，降低本车道及相邻车道的饱和流率分别为6.15%和3.92%；排序区车辆滞留会导致下一相位车辆阻塞并降低其饱和流率，发生概率与信号控制及车辆运行速度有关，可通过设置足够的清空时间来避免。

【关键词】交通工程；饱和流率；概率论；排阵式信号交叉口；实测数据；因素分析法

Revision of Saturation Flow Rate at Tandem Intersections Based on Field Data

Zheng Zhe, Ma Wanjing, Wang Ling

Tongji University，The Key Laboratory of Road and Traffic Engineering of the Ministry of Education，Tongji Univer Sity Shanghai 201804

Abstract: In order to accurately calculate the saturation flow rate at pre-signal intersections, the saturation flow rate adjustment model for pre-signal intersection was established based on the measured data. First, the field data of the sort area in Qian Hai Rd. in Shenzhen was collected by video cameras. It was shown that the saturation flow rate of the sort area was significantly affected by the pre-signal control based on comparison analysis. Then, with the factor analysis method, the in fluence of the saturation flow rate in sort area was analyzed from three aspects, including the unfa miliar operation, the lane utilization in sort area, and the sort area retention. The saturation flow rate adjustment model was established using the probability theory and mathematical statistics ac cordingly. Results show that the pre-signal control brings negative impact on saturation flow rate of the approach lanes, although it can significantly improve the capacity of the whole intersection with the dynamic use of approach lanes. The uneven utilization of lanes in sort area is the main factor of the effect in saturation flow rate caused by pre-signal control, with the reduction by 15.32%. The il legal driving into the sort area caused by unfamiliar operation can cause the lane blockage, which reduces the saturation flow rate in this lane and adjacent lane for 6.15% and 3.92%，respective ly. The sort area retention causes the vehicle blockage in the next phase and reduction of the satura tion flow rate, which is affected by the signal timing and vehicular speed. It could be avoided by set ting sufficient clearance time in practice.

Key words：traffic engineering;saturation flow rate;probability theory;pre-signal intersections;measured data;factor analysis method