对于机动车左转流量较大的交叉口，利用时空结合方法设置可变车道是提高城市道路交叉口左转通行能力的一种重要途径。文章根据可变车道的设置依据、设置条件及行驶规则，构建了信号交叉口可变车道左转通行能力的计算模型以及左转通行能力优化模型，通过微观仿真对模型进行了验证。结果表明：可变车道对交叉口左转通行能力的影响显著，左转通行能力的模型计算与仿真结果平均误差为4.1%，与实际通行能力接近；可变车道长度与有效绿灯时间是影响可变车道左转通行能力主要因素；通过优化模型可以得到最佳可变车道长度和有效绿灯时间，结合实际调查数据，得到经十路和舜耕路交叉口高峰期最佳左转有效绿灯时间为28 s，平峰期最佳左转有效绿灯时间为35 s。%In the left-turn intersection with large traffic flow,it is an important way to improve the capacity using the method of set a variable lane combined with space and time. In this paper,the condition and traffic rules of variable lane are analyzed firstly. Then,the variable lane traffic capacity model and optimization model of left-turn is presented and moreover verified by simulation. The results indicate that the deviation between calculated result and simulated result is 4 . 1%. Variable lane is significant to improve the left-turn capacity. Furthermore,both the length of variable lane and effective green time are the main influence factors of variable lane capacity. According to the proposed model,we can find the optimal length of variable lane and effective green time so as to get the maximum left-turn capacity. Finally,by combining the real data of intersection in Jingshi Road and Shungeng Road,the optimum effective green time in peak hour is changed to 28 s and the optimum effective green time in average hour is changed to 35 s.
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