基于交通冲突的城市道路近距离交叉口安全性研究  

Study on traffic safety of road segment between urban close-quarter intersections based on traffic conflicts

作　　者：王含含 宋永朝[1] 祝涛 潘晓东[2] WANG Hanhan;SONG Yongchao;ZHU Tao;PAN Xiaodong(School of Traffic&Transportation,Chongqing Jiaotong University,Chongqing 400074,China;School of Transportation Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]重庆交通大学交通运输学院,重庆400074 [2]同济大学交通运输工程学院,上海201804

出　　处：《湘潭大学学报（自然科学版）》2024年第2期50-62,共13页Journal of Xiangtan University(Natural Science Edition)

基　　金：国家自然科学基金项目(51278361);长沙理工大学公路工程教育部重点实验室开放基金项目(kfj130102)。

摘　　要：城市道路近距离交叉口有换道需求的车辆需在较短间距完成变道,区间内交通流交织干扰严重,是交通事故的主要成因.为研究近距离交叉口交织段冲突的严重程度,提出交通冲突强度(ITC)的定义,采用交通冲突空间强度(SITC)和时间强度(TITC)分别量化研究区间在单位通行距离和时间上的冲突强度指标.综合分析区间交织段交通流运行特征,采用交通微观仿真手段在考虑相邻交叉口区间多种道路交通参数条件下(如:交叉口间距、V/C、行驶速度等),确定交通冲突强度判定阈值,通过灰色聚类方法提出了相邻交叉口交通冲突危险程度等级划分建议值.最后,运用交通冲突强度方法剖析了工程实例相邻交叉口交通冲突状态,并对工程实例改善前后的交通冲突强度进行了对比分析.研究表明:交通冲突空间强度指标具有静态属性,交通冲突时间强度指标综合了速度参数,具有动态属性,交通冲突强度可以量化交织段冲突程度,筛查交织干扰严重路段,“左转右置”改善方法可有效降低左转需求大的近距离错位交叉口交通冲突强度.Vehicles need to complete lane change operations at short distances by reason of its lane-changing demand,to generate serious traffic flow interference between two adjacent intersections,which is the key to cause traffic safety problems at urban road close-quarter intersections.In order to study the conflict severity of the interleaving section at the close intersection,a concept of intensity of traffic conflict(ITC)was defined.The spacing intensity of traffic conflicts(SITC)and the time intensity of traffic conflicts(TITC)are used to calculate respectively traffic-conflicts intensity of unit travel distance and unit travel time at two adjacent intersections.Traffic flow characteristics of interlaced sections was analyzed comprehensively at close-quarter intersections.Considering fully some key road parameters and traffic parameters at two adjacent intersections(such as:interval distance of two adjacent intersections,V/C,travel speed,etc.),the determination threshold value of the time intensity of traffic conflict was proposed at close-quarter intersections by traffic microsimulation technology.The recommended value of the traffic conflict hazard level was proposed at two adjacent intersections by grey clustering method.Finally,by using traffic conflict intensity method to analyze the project example of adjacent intersections traffic conflict condition,and the engineering examples,before and after the improvement of traffic conflict intensity is analyzed.Research results showed that spacing intensity of traffic conflicts(SITC)index had static attribute.The time intensity of traffic conflicts(TITC)index had dynamic properties,owing to contain speed parameters.The intensity of traffic conflict can be used to quantify the degree of conflict in interleaved sections and screen the sections with serious interleaved interference.The improvement measure of"left-turn lanes to set up on right side"could effectively reduce traffic conflict intensity of close stagger intersections with high turn-left traffic demand.

关 键 词：交通工程 交通冲突点 强度分析 近距离交叉口 交叉口间距 改善方法 

分 类 号：U491[交通运输工程—交通运输规划与管理]