中文摘要：

交叉口是城市路网的重要组成部分之一。交叉口延误对人们出行服务与交通网络规划有着非常重要的意义。借鉴了图论中的对偶图思想将传统城市路网结构转换为对偶网络，结合北京市浮动车数据，建立交叉口延误分析模型，生成随时间动态变化的城市对偶路网序列图。通过对交叉口不同转向的延误数据生成的趋势图进行可视化分析，探讨交叉口延误规律，为人们出行服务与动态路径规划提供依据。

英文摘要：

The intersection is one of the important components of the city network. Delay of the inter- section plays a vitally important role in transport planning and transport service. This paper is intended to describe a dual graph of city road network instend of traditional form and generate a sequence diagram of city road network. The proposed method can measure the delay of each turns of intersection, and trend graph can get the spatial and temporal distributed pattern. These methods are very helpful to comprehend the delay data of intersection,also useful for traffic management departments to make decision scientifical- ly. In the case study, traffic congestion indices are evaluated using the floating car data collected in one day of July, 2007 in the downtown of Beijing,delay of the intersection are computed by counted delay analysis model.