Abstract: The function relationships between saturation flow rate and the phase lost time at the time of entering of large truck was analyzed through the establishment of microscopic traffic simulation model to further obtain the traffic capacity at signal-controlled intersection of port road. The results of simulation reveal that the saturation flow value and heavy truck rate is in the functional relationship of inverse proportion while the phase lost time value and rate of heavy trucks is in quadratic function relationship. Practical examples show that the calculated value resulted by the method proposed is very close to the actual traffic capacity value without little deviation, which justifies the rationality and effectiveness of this given method.

Key words: traffic and transportation engineering, collection and distribution road； traffic capacity；saturation flow；phase lost time

摘要： 通过建立微观交通仿真模型分析大车混入时饱和流率值和相位损失时间的变化规律，进而推求疏港道路信号控制交叉口通行能力。分析仿真结果发现饱和流率值与大车率呈反比例函数关系，相位损失时间与大车率呈二次函数关系。实例表明：与实际通行能力值相比，采用文中提出的计算方法所得值误差较小，说明该方法合理有效。

关键词: 交通运输工程, 疏港道路, 通行能力, 饱和流率, 相位损失时间