城市道路占路施工过程中,上游过渡区长度设置对施工区交通安全、通行效率以及道路性能都有影响。在分析上游过渡区长度计算公式这一分段函数的基础上,利用vissim进行仿真实验,选取延误、排队长度和交通冲突次数为评价指标进行最佳长度的遴选。并在实际施工中对公式计算值和仿真结果进行验证,最终给出上游过渡区设置长度的建议值。 During the occupation of urban roads, the length of the upstream transition zone has an impact on traffic safety, traffic efficiency and road performance in the construction area. Based on the analysis of the piecewise function of the calculation formula of the length of the upstream transition zone, the simulation experiment was conducted by using vissim, and the selection of the optimal length was made by selecting the delay, the queue length and the number of traffic conflicts as the evaluation indexes. In the actual construction, the calculated values ​​and the simulation results are validated. Finally, the recommended value of the length of the upstream transition zone is given.