信号交叉口拓宽专用双左转车道通行能力研究

摘要

Based on the survey data of three signalized intersections with widened dual left-turn lanes in Beijing, traffic characteristics and capacity of left-turn lanes at signalized intersections were studied by using statistical methods. It shows that the saturated discharge rate of left-turn lanes passes through two phases. By considering the characteristics, a theoretic n odel for capacity was developed. Finally, the model was validated by using simulation data. It is concluded that the proposed model provides more accurate results compared with the HCM model.%在北京市3个信号交叉口拓宽双左转车道交通流数据调查的基础上,应用数理统计学方法对拓宽条件下专用双左转车道的交通运行特性和释放流率进行了研究.发现拓宽专用双左转交通流释放流率呈现出明显的两阶段特性,结合该特性给出了通行能力计算模型,最后采用仿真的方法对模型进行了验证.结果表明:通过与HCM提出的方法对比发现,文中提出的模型更能合理的计算拓宽条件下专用双左转车道的通行能力.