Abstract: This paper presents a CORSIM-based simulation approach to evaluating the effects of incident management and signal timing modifications on traffic operations along I-75 and alternative routes in Sarasota County, Florida, U.S.A. The County has developed special countywide signal timing plans on alternative routes to guide and direct motorists coming off the interstate (I-75) back onto the interstate at an appropriate location when a traffic incident happens on I-75. These special signal timing plans were developed for six incident conditions using the SYNCHRO signal timing software. Based on the SYNCRHO data provided by Sarasota County, a CORSIM data set was developed for the evaluation of the effectiveness of the route diversion plan. The findings from the CORSIM analysis indicate the route diversion plans developed by the County are very effective in terms of traffic operations, reducing overall network delay by an average 21%. An additional sensitivity analysis was conducted for one of six incident conditions to examine the impact of diverted traffic volume on traffic operations. The results implied that the percentage of diverted traffic volume had a great impact on the total delay of the entire network. A 10% diverted traffic volume was found to give minimal total network delays based on the case study.

Key words: freeway incident management, simulation, delay, diversion routes, signal timing

摘要： 基于CORSIM仿真方法评价美国佛罗里达州萨拉索塔市I-75州际高速公路及其备用线路上交通事件管理和信号配时变更对交通运行状况的影响。在萨拉索塔市的备用线路上建立全市范围的信号配时方案，当I-75高速公路上发生交通事件时，引导和指示车辆从适当的地点离开并返回高速公路。利用SYNCHRO信号配时软件建立六种交通事件情况下的信号配时方案。根据萨拉索塔市SYNCHRO数据，产生CORSIM数据集以评价路径变更方案的效果。通过CORSIM分析结果显示，从交通运行状况上看，萨拉索塔市的路径变更方案十分有效，使路网整体延误平均降低21%。另外，对其中一种交通事件情况下，转移的交通流量大小对交通运行状况的影响进行敏感性分析。结果表明，转移的交通量大小对于整个路网延误有显著影响。在本文的实例分析中，转移10%的交通量对整个路网的延误最小。

关键词: 高速公路交通事件管理, 仿真, 延误, 路径变更, 信号配时