中文摘要：

为向交通管理、道路改造、交通出行等提供服务，以定点检测线圈数据为基础，根据交通参数关系拟合后得到拥挤阈值，对交通参数时空变化图进行瓶颈位置识别，再使用“变形累计曲线法”进一步研究瓶颈附近交通拥挤特征。此外，文章对“变形累计曲线法”中关键问题进行了讨论，得到了曲线变化所揭示的意义和背景参数值的确定方法。以上海市南北高架东侧部分路段为例，对早上6：00-12：30瓶颈附近路段的拥挤状况进行了分析，确定了瓶颈位置并得到了瓶颈处拥挤的开始时间、结束时间和拥挤持续时间。

英文摘要：

In order to offer services for traffic management, road upgrading and traveling, based on loop detector data, the fitted congestion thresholds were determined according to the relationship of traffic parameters.Then the temporal-spatial diagrams congestion characteristics of traffic parameters were analyzed to identify the location of bottleneck. At last, the of bottleneck were analyzed using the method of Transformed Cumulative Curves. In addition,the key of the method of Transformed Cumulative Curves was discussed, and the significance of curves＇ changes and a better method to determine the background parameters were acquired as a result. Taken a section of Shanghai North-South viaduct expressway during 6 ： 00. to 12 ： 30. as an example, the location of bottleneck, the activate time, deactivate time and the duration of the bottleneck were obtained .