考虑左转车道饱和度的左弯待转区设置研究

Study on Left-Turn Waiting Area Setting Considering Traffic Saturation

合理的左弯待转区设置可以大幅度提高左转车辆的通行效率。首先,针对不同交通饱和度的左转车道,探究了左弯待转区的设置条件及设置效益;其次,通过考虑待转区容量、绿灯间隔时间和机动车微观特性等因素,修正了左转车道通行能力模型;最后,基于南京市交通调查和VISSIM仿真分析,验证上述修正模型。研究结果表明:1)左弯待转区的渠化设计利于左转车道通行能力的提升,但随着交通饱和度的增大,通行能力的增量减小,左转车辆的最大排队长度增大;2)通过VISSIM仿真分析,在考虑了待转区容量等因素对左转车道通行能力的影响后,修正的左转车道通行能力模型可将误差控制在2%以下。

A reasonable left-turn waiting area setting can greatly improve the capacity of the left-turn lane.Firstly,the conditions and effects of left-turn waiting area setting are explored under different traffic saturation of left-turn lanes.Secondly,the capacity model of left-turn lane is modified considering the factors such as the capacity of waiting area,change interval and the microscopic characteristics of the vehicles.Finally,the above modified model is verified by traffic survey and VISSIM simulation.The results show:1)The left-turning waiting area channelization is beneficial to the improvement of the left-turn lane capacity,but with the increase of traffic saturation,the effect is smaller and the maximum queue length is larger;2)Through VISSIM simulation,the error of the capacity model can be controlled below 2%considering the influence of factors such as the waiting area capacity.