基于概率模型的具有短车道的信号交叉口进口道通行能力研究  

Capacity of Signalized Intersection Approach with Left-turn Short-lane Based on Probabilistic Model

作　　者：何丹恒[1] 常云涛[1] 彭仲仁 陈海涛[3] 

机构地区：[1]同济大学交通运输与工程学院,上海201804 [2]弗罗里达大学设计建设与规划学院 [3]上海交通大学交通研究中心,上海200240

出　　处：《公路交通科技》2014年第9期124-131,共8页Journal of Highway and Transportation Research and Development

摘　　要：分析了短车道效应对进口道拓宽车道通行能力的影响,基于交通流理论和概率论,提出了考虑短车道排队阻塞情况下的信号交叉口进口道通行能力计算模型。该模型根据进口道中3种转向车流的比例、短车道几何特征以及信号周期计算一个信号周期中两种不同短车效应的发生概率,并计算各自情况下的进口道通行能力。进一步探讨了该模型中转弯车辆比例、短车道长度、信号周期长度、绿信比的变化对通行能力的影响。研究发现短车道对通行能力的主要影响因素包括左转车比例、短车道长度和绿信比,且当左转车比例在50%左右时,增加短车道长度能显著提高通行能力。此外,使用西安和上海的实测数据对本模型和HCM2000通行能力模型进行验证和对比,本模型的计算结果比HCM2000模型更加精确,误差小于200 pcu/h。We analyzed the impact of short-lane effect on widened approach. Based on traffic flow theory and probability theory,we proposed a capacity model of approach at signalized intersection considering queuing congestion on short lane. The model calculates the probability of 2 kinds of short-lane effect in a signal circle according to the proportions of left-turn,through and right-turn vehicles and the geometric feature of the widened short-lane and signal circle,and then calculates the capacity of the approach for each case. We further analyzed the relationship between capacity and the factors such as the proportion of turning vehicles,length of the widened short-lane,cycle length of signals and green split. It is found that（ 1） the main influencing factors of short-lane on the capacity are the ratio of left-turn vehicles,short-lane＇s length and green split;（ 2） when the proportion of left-turn vehicles is around 50%,increase of short-lane＇s length can significantly improve the capacity of the approach. In addition,we used the field data of Shanghai and Xi＇an to verify both the proposed model and HCM2000 model. The result shows that the calculation result of the proposed model is more accurate than that of HCM2000 model,the error of the proposed model is within200 pch /h.

关 键 词：交通工程 通行能力 概率模型 短车道 进口道 

分 类 号：U491[交通运输工程—交通运输规划与管理]