交叉口待行区设置条件与通行效能分析

Analysis of the Intersection Standby Area Setting Conditions and Traffic Efficiency

针对城市道路扩建与进口渠化拓宽引发的交叉口几何空间过大、车辆通过时耗过长、车流轨迹冲突加剧等交通问题,基于不同待行区渠化设计图,从空间和时间两个维度分析了左转、直行与综合待行区的设置条件,结合不同转向车流消散运行规律,基于“停止线”与“冲突点”两类参照系,构建待行区交通组织通行效能理论计算模型,推导了给定设计条件下待行区单位周期通行效能提升率。案例仿真分析表明,单进口道待行区的合理设置与科学组织对于提升交叉口的通行效能近似可达单位周期2 pcu/cycle,进一步验证了基于“停止线”与“冲突点”参照系条件下的通行效能理论计算模型的科学性与有效性。

In view of the traffic problems such as the large geometric space of the intersection caused by the urban road expansion and the import channelization widening, the long time consumption of vehicles, and the intensified traffic flow track conflict, based on the channelization design diagram of different standby areas, the setting conditions of left turn, through and comprehensive standby areas are analyzed from space and time dimensions. Combined with different steering traffic flow dissipation operation pattern, the theoretical calculation model of traffic organization traffic efficiency in the standby area is constructed, and the improvement rate of unit cycle traffic efficiency in the standby area under given design conditions is deduced, based on the two reference frames of “stop line” and “conflict point”. The case simulation analysis shows that the reasonable setting and scientific organization of the standby area at intersection is 2 pcu/cycle, which further verifies the scientificity and effectiveness of the traffic efficiency theory based on the reference frames of “stop line” and “conflict point”.