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信号控制交叉口进口道存在车辆掉头行驶的需求,不同的道路条件及交通状况下,掉头车辆所需的掉头条件也不同.为确定合适的信号交叉口进口道掉头设计条件,使车辆能够安全有序地通行,在仿真车辆掉头行为的基础上,分析车辆运行轨迹特性,建立了掉头空间计算判别模型;同时基于信号交叉口车辆排队及换道理论模型,建立了掉关设置位置计算模型.最后选取一实例对上述两个模型进行验证,结果表明模型精度较高,计算方法可行.“,”There is a demand for U-turn at intersections of signal controlled intersections.The U-turn conditions required for U-turn vehicles vary with different road and traffic conditions.To determine the appropriate U-turn design conditions at the entrance of the signalized intersection so that vehicles can passsafely and orderly,based on the simulation of the U-turn behavior of the vehicle,the characteristics of the vehicle trajectory are analyzed and a U-turn space discriminant model is established.Based on the theoretical model of vehicle queuing and lane change at signalized intersections,a calculation model for the U-turn setting position is established.Examples are chosen to verify the above two models.The results demonstrate that the models have high precision and the calculation methods are feasible.