基于可变车道的交叉口左转公交优先方法

为减少左转公交在信号交叉口的延误，提高通行效率，本文提出一种新的基于公交预信号的可变公交车道(VBAL)控制方法.提出VBAL的渠化模型及主预信号控制模型，利用车辆累积曲线图示法以现状的单左转(SLTL)方案为基准，将VBAL方案与双左转(DLTL)方案比较；建立左转公交和直行车辆延误变化量的计算模型，并进行灵敏度分析.结果表明，VBAL 方案能够在有效降低左转公交延误的同时，最大程度减少直行车辆延误的增加.最后，实例分析证明了VBAL方法的可行性.

Method of Bus Left-turn Priority at Intersection Based on Variable Lane

In order to reduce the delay of left-turn buses at signalized intersections and thus improve the traffic efficiency, a variable bus approach lane (VBAL) control method based on bus pre-signal is developed. Firstly, the geometric model and the main signal and pre-signal control model for the variable bus lane are proposed. Next, the single left- turn lane (SLTL) scheme is compared with the double left- turn lane (DLTL) scheme by vehicle cumulative curve, and the delay calculation model of left- turn bus and through car is established. And the sensitivity analysis of the model is carried out. The results show that the VBAL scheme can effectively reduce the delay of left-turn bus, and minimize the increase of the delay of the through vehicles. Finally, the feasibility of the VBAL method is proved by the case analysis.