Abstract: This paper analyzes link travel time during incident on urban expressway, and presents the functions of link travel time. The function of link travel includes four parts when the traffic demand upstream exceeds the capacity at bottleneck. The focus is on calculating the vehicle running time upstream bottleneck and the delay time at bottleneck, and a traffic flow wave theory is used to calculate queuing length and the number of queuing vehicles. It gives a theory foundation to design emergency rescue system.

Key words: incident, bottleneck, wave theory, travel time

摘要： 分析了高速道路交通事故发生后事发路段行程时间构成，提出在上游交通需求大于瓶颈段的通行能力的情况下，事发路段的行程时间由四部分组成，并给出了各部分的计算模型；利用车流波动理论推导出瓶颈处的排队长度，并进一步给出排队车辆数，得出了车辆在瓶颈段上游行驶时间的模型和在瓶颈前排队等待时间的模型。本研究为开发高速道路紧急救援系统提供了理论依据。

关键词: 交通事故, 瓶颈, 波动理论, 行程时间