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左弯待转区的设置可提高信号交叉口左转车道的通行能力。以实际的左弯待转区左转车道车流调查数据及无左弯待转区左转车道的通行能力计算公式为基础,通过提取左弯待转区左转车道排队车辆从起步到驶离交叉口的加速度、速度及位移特征规律,建立了左弯待转区左转车道实际通行能力的计算方法,并进行了实例验证计算。研究结果表明:左转相位绿灯亮起后,静止时排队的车辆逐次起步,车辆加速度随时间呈起伏式线性变化;左弯待转区可较显著地提高左转车道的实际通行能力,所提高比例与左转相位配时及左弯待转区长度有关;所调查的信号交叉口左弯待转区的设置提高了左转车道通行能力10%~20%。
The setting of the left corner turnaround improves the traffic capacity of the left turn lane at the signalized intersection. Based on the actual left-turn lane turn-around traffic data and the formula for calculating the traffic capacity of the left turn lane in the left turn waiting area, Mouth acceleration, speed and displacement characteristics of the law, the left corner of turn left turn lane actual traffic capacity of the calculation method, and an example to verify the calculation. The results show that the vehicles with queuing at standstill start to appear one after the other with the green light turn left, and the vehicle acceleration changes in a rolling manner linearly with time. The left turn waiting zone can significantly improve the actual traffic capacity of the left turn lane, The proportions are related to the left-turn phase distribution and the length of the left-turn corner zone. The left-turn turn-around zone of the signalized intersection improved the traffic capacity of the left turn lane by 10% to 20%.