左转自行车对直行机动车通行的影响分析模型

首先分析了四路平面信号交叉口的交通流冲突，并应用穿越间隙理论，通过实际观测数据得到了左转自行车穿越直行机动车辆的概率分布模型，推导了左转自行车在一个信号周期内穿越直行车流的车辆数计算公式，以及左转自行车在一个信号周期内由于不能穿越直行车流而继续等待下次绿灯时间通过的滞留的车辆数计算公式．通过定量分析，最后得到了左转自行车对直行机动车的影响分析模型，为设置非机动车专用信号相位提供了理论依据．该研究为信号交叉口的信号设计，特别是非机动车专用信号相位的设置、分析和研究提供了新思路和新方法．

Analysis model of influence of left-turn bicycle on passage of straight-through vehicles

Firstly, the conflict at four-cross signalized intersection is analyzed. Based on the theory of passing through gap and the data from observation, the probability chorological discipline model of the left-turn bicycles is put forward. And the formula for the numbers of left-turn bicycles passing through the straight-through vehicle flow in one signal cycle is deduced. The formula for the numbers of detained left-turn bicycles which fail to pass through the vehicle flow in one signal cycle and have to wait for next green-time is also deduced. By the quantitative analyses, the analysis model of the influence of left-turn bicycles on the straight-through vehicle flow is set up, which provides a theoretical basis to the foundation of installing the appropriative bicycle phase. This study presents a new idea and methods to the signal design, especially the bicycle phase setting, at the signalized intersection.