A Surveys of Detour Guidance Operations on Expressways

日本高速公路网的总长度现在超过6,500公里，每天有300多万辆汽车使用它们。高速公路网是支撑日本经济、产业和社会活动的重要基础设施之一。然而，随着交通需求的增加，高速公路使用者目前在城市地区的高速公路路段以及农村地区的干线路段上遭受严重的交通拥堵。为了科普这种情况，高速公路管理部门正在敦促司机更有效地利用高速公路系统，告知他们每个高速公路路段的当前行程时间，以选择有效的路线。有鉴于此，为了模拟高速公路上的长距离交通，评价绕行诱导的有效性，对高速公路瓶颈仿真模型进行了改进。以东名神高速公路丰田立交至京都东立交约180 km路段为研究对象，进行了一系列交通调查，并根据调查数据对修正后的仿真模型进行了标定，开发了基于标定后的仿真模型的长距离高速公路旅行时间估算和绕行路线选择方法。

The total length of the Japanese expressway networks now exceeds 6,500 km and more than three million vehicles are now using them every day. The expressway networks are one of the most important infrastructures which support Japanese economic, industrial and social activities. However, with the increasing traffic demands, expressway users are now suffering heavy traffic congestion on expressway sections in urban areas as well as on trunk route sections in rural areas. In order to cope with this situation, express highway authorities are urging drivers to make more effective use of the expressway system by informing them of the present travel time of each expressway section for selecting effective route.In view of this, a computer simulation model called the expressway bottleneck simulation model was modified to simulate long distance traffic on expressways and to evaluate the effectiveness of detour guidance operations.A series of traffic surveys were conducted on the Tomei and Meishin Expressway covering section about 180km in length from the Toyota interchange to the Kyoto East interchange and the modified simulation model was calibrated based on the data collected during the survey.A procedure for estimating long distance expressway travel time and selecting an appropriate detour route was developed using the calibrated simulation model.