中文摘要：

通过对城市道路路段及交叉口出口道自由车速的特性分析，获得自由车速与车道宽度的关联性．选取杭州市交通设施相似、车道宽度不同的9条道路进行车速调查，并采用视频检测及图像识别技术提取车速数据．经数据分析得出，路段及交叉口出口的自由车速服从正态分布，且特征车速随车道宽度增加有上升趋势；建立车道宽度对车速离散情况影响模型，得出交叉口出口及路段车速离散情况随车道宽度的变化趋势．研究结论说明，合理设置道路车道宽度有利于限制车速和提高道路安全性。还可以为城市交通流建模及城市交通管理提供依据．

英文摘要：

Relationship between free-flow speed and lane width is analyzed by studying characteristics of free-flow speed of urban road sections and exit lane at intersections. Field data of speed are collected from 9 roads with similar facility and different lane width in the urban area of Hangzhou by using video detection and recognition technology. The data show that the free-flow speeds obey the normal distribution, and the characteristic speed increases with the lane width. A model is established to describe the relationship between lane width and the speed discreteness. According to this model, the trend of speed discreteness is presented. The conclusion shows that reasonable value of lane width is beneficial to restricting running speed and improving road safety. This research also contributes in urban traffic flow modeling and traffic management