车辆提前掉头几何参数设置及阈值流量研究  

Vehicle Early Turnaround Geometry Parameter Setting and Threshold Flow Study

作　　者：张小龙 赵界 李冰[2] 杨鸿宇 ZHANG Xiaolong;ZHAO Jie;LI Bing;YANG Hongyu(Tonghao Wisdom City Research and Design Institute Co.,Ltd.,BeiJing 100071;Transportation Engineering College,Kunming University of Science and Technology,Kunming 650500)

机构地区：[1]通号智慧城市研究设计院有限公司,北京100071 [2]昆明理工大学交通工程学院,昆明650500

出　　处：《公路交通技术》2022年第1期135-141,148,共8页Technology of Highway and Transport

基　　金：国家自然科学基金项目(71771062)。

摘　　要：为提高城市道路车辆掉头安全与通行效率,以传统四相位信号控制交叉口为研究对象,提出路段提前掉头设置条件与方法。同时以车辆通行安全和效率为目标,构建了车辆提前掉头开口位置与上下游交叉口距离的判别模型、掉头车流排队长度以及掉头开口大小等关键几何参数设置模型,提出了路段提前掉头车均延误计算方法,并和交叉口掉头方案相比较,得出设置路段提前掉头时掉头车道左转及掉头车流量的阈值条件。选取昆明市典型十字交叉口为例进行VISSIM仿真计算,验证了本文模型与方法的准确度和可靠性。结论是:以车均延误为优化目标,当交叉口掉头车道左转和掉头车流量分别小于550 pcu/h和350 pcu/h时,路段提前掉头比交叉口掉头更具优势。Taking the traditional four-phase signalized intersection as the research object,the setting methods and conditions of early U-turn are proposed to improve U-turn safety and passage efficiency of urban road.With the safety and efficiency of vehicle traffic as the goal,the discrimination model of the distance between the opening position of early U-turn and the upstream and downstream intersections,and the calculation model of key geometric parameters such as the queue length of U-turn traffic and the size of U-turn opening are constructed.The calculation method of average delay of early U-turn vehicles is put forward.Compared with the U-turn scheme at intersections,the threshold conditions of turning left and turning traffic flow are obtained.Finally,a typical intersection in Kunming is selected as an example to calculate the corresponding parameters,and the accuracy and reliability of the model and method in this paper are verified by VISSIM simulation.The results show that,with the average vehicle delay as the optimization objective,when the traffic volume of turning left and turning around in the turning lane is less than 550 pcu/h and 350 pcu/h respectively,it is more advantageous to turn around in advance than turning around at intersections.

关 键 词：交通工程 阈值流量 车均延误 提前掉头 交通仿真 

分 类 号：U491[交通运输工程—交通运输规划与管理]