信号交叉口左转专用可变车道设置研究

针对某些城市信号交叉口各流向交通流量分布不均导致的左转车道拥挤问题,为减少交叉口的道路资源浪费,提出在交叉口出口道设置左转专用可变车道的交通组织方法.结合已有理论研究,归纳出左转专用车道的静态和动态适用条件,并确定左转可变车道的长度、开关时间等参数的计算模型.以威海市某信号交叉口为例,通过交通调查与分析,提出设置西进口左转专用可变车道的可行性,并使用Vissim微观仿真的方法对左转可变车道的应用效果进行模拟分析,最后给出该交叉口的交通管理设施设置方案.方案实施前后仿真结果表明,可变车道设置后的20个周期内,左转车流的延误降低51%,排队长度降低72%,左转效率得到了极大提升. 

Design of the Left-turn Variable Lane at Signalized Intersection

In view of the congested situation of left-turn lane caused by directional uneven traffic distribution at some urban signalized intersections,this paper proposes a traffic organization method by designing left-turn variable lane to reduce road resources waste.Based on the research theories of variable lane,this paper induces the static and dynamic application condition and derives the calculation model of parameters such as lane length,opening and closing time.Using a signalized intersection in Weihai as an example,based on actual traffic investigation,this paper proposes the feasibility of the left-turn variable lane and analyzes the model by Vissim micro-simulation.Simulation results show that the left-turn efficiency after setting the left-turning variable lane can be greatly improved with left-turn delay reduced by 51% and queue length reduced by 72%in 20 cycles.