中文摘要：

文章针对交通波模型应用于城市道路排队长度估算所存在的问题，评述了累计到达-离去模型应用的优势。通过对累计到达-离去模型的三种变形形式的分析比较，选用出其中的一种模型为基础模型进行改进，得到城市交叉口交通拥挤最大排队长度估算模型，并通过VISSIM仿真实验验证了这一改进模型的实用性。

英文摘要：

Based on the problem exists during using the applied traffic wave model to estimate city road queue length,the paper presents the advantages of using cumulative reach - leave model.Through the analyzing and comparing of the three variations of the cumulative reach - leave model, one of the models was chosen to make improvement.From the improved model,we obtained model that can estimate max-imum queue length of urban road congestion.Also by VISSIM simulation re- sults,we prove the practicability of this model.