基于关键冲突车流的交叉口饱和度计算及应用  

Degree of Saturation of Intersections Based on Critical Conflicting Flows

作　　者：倪颖[1] 李克平[1] 

机构地区：[1]同济大学交通运输工程学院,上海201804

出　　处：《武汉理工大学学报（交通科学与工程版）》2010年第1期31-34,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家科技支撑计划项目资助(批准号:2006BAJ18B07)

摘　　要：提出基于关键冲突车流的交叉口饱和度(CCF饱和度)计算方法,可得出最佳配时条件下的整个交叉口(信号控制或非信号控制)的饱和度.该方法可用于信号控制设计前的交叉口渠化方案优化,同时适用于中观层面交叉口评价,可迅速识别区域关键交叉口.将典型十字形交叉口冲突车流分为2类8组,取冲突车流组合中车道流量之和与冲突点(区域)通行能力之比的最大值作为交叉口饱和度,计算中考虑进口合用车道、右转机动车不受控、行人与非机动车干扰等因素对饱和度的影响.将CCF饱和度与Webster相位等饱和度进行对比,并给出CCF饱和度的应用实例.Degree of saturation of intersections based on critical conflicting flows （CCF） has been proposed, which can be recognized as a degree of saturation of the whole intersection. Compared with degree of saturation proposed by Webster, CCF is the possible maximum degree of saturation under optimal signal control when lane arrangement is fixed. It can be used to check lane arrangement and evaluate LOS of intersections on the level of mesoscopic. Calculation procedure of CCF is as follows： decide conflicting flows, calculate degree of saturation of different conflicting flow combination and choose the maximum value as the result. Saturation flow of conflict area has been calibrated from such aspects as shared lanes, right-turning vehicles, impact of pedestrians and bicycles. CCF has been ap- plied in traffic impact analysis of a certain area in Hangzhou. By using this degree of saturation, criti- cal intersections and critical flows of each intersection have been recognized, which helped improving the lane arrangement rapidly and effectively.

关 键 词：饱和度 冲突点(区域) 关键冲突车流 渠化方案 

分 类 号：U491.231[交通运输工程—交通运输规划与管理]