摘要
交叉口在潮汐交通影响下会产生各流向不均衡现象,容易使进口道利用效率低下,形成拥堵。常用的应对措施是设置适用于交叉口的导向式可变车道。基于可变车道,提出信号交叉口时空资源优化配置方法。在空间上,为寻求交叉口各流向之间的均衡化,以同一相位下各流向流量比之间的差值尽可能小以及总体的流量比之和尽可能小为目标,以各进口道各流向的交通量为基础数据,考虑进、出口道通行能力匹配等约束,同时考虑直右合用车道设置问题,构建车道功能划分模型。时间上配以Webster信号配时模型。以时段为单位,得到各个时段优化的车道功能划分和信号配时,从而确定可变车道的设置。以实际交叉口为案例,通过设置现状组、对照组、模型组对比分析该方法的效果。通过Vissim交通仿真,结果表明,相比于固定的车道功能,模型优化后能降低交叉口10%的延误。
A phenomenon of unbalanced traffic flows at intersections is affected by traffic tide,which causes low efficiency and traffic congestions in approaching lanes.A common countermeasure is to set variable approach lanes for intersections.Based on it,a method for optimal allocation of time and space resources at signalized intersections is developed.In space,a model of lane-use assignment is established to balance different traffic flows at intersections.It aims at minimizing differences of flow ratios at the same signal phase and total flow ratios.Considering constraints such as matching capacity between approach and exit lanes,and setting of straight-right lanes,volume data of each flow at each approach lane is used in the model.In time,a Webster signal timing model is used.The method can optimize lane-use assignment and signal timing for every period,then determine setting of variable lanes.Taking an actual intersection as a case study,outcomes of the method is analyzed by compared with a state group,a control group,and a model group.A traffic simulation based on Vissim shows that the model can reduce 10%delay at intersections.
作者
曾昕
徐建军
吴志周
ZENG Xin;XU Jianjun;WU Zhizhou(The Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China;ENJOYOR Company Limited,Hangzhou 310030,China)
出处
《交通信息与安全》
CSCD
北大核心
2018年第6期81-89,共9页
Journal of Transport Information and Safety
基金
浙江省智能交通工程技术研究中心开放课题基金项目(2016ERCITZJ-KF05)资助
关键词
交通管理与控制
车道功能划分
优化模型
信号交叉口
潮汐交通
可变车道
traffic management and control
lane-use assignment
optimization model
signalized intersection
traffic tide
variable lane
