中文摘要：

车速是描述车辆运行状态的基本参数，而掌握城市主干路路段车速分布特性更是许多后续研究的基础。本文以南京市部分主干路调查得到的数据为基础，运用统计学方法，对城市主干路路段车速分布特性进行了研究。首先，通过对车速的分布形式进行拟合，定性分析了不同类型主干路的分布形式；然后，从路段整体、横向两个角度对车速分布的集中趋势和离散程度进行了分析。结果表明，城市主干路路段车速分布的形式主要与车辆行驶时的自由度有关，道路条件以及交通流状态对车速分布的参数值有着不同程度的影响。研究成果将对城市主干路的规划、设计、控制、管理以及评价提供科学依据和数据支持。

英文摘要：

Speed is a basic parameter for describing the state of vehicle operation. Mastering the speed distribution characteristics of a basic section of the urban major arteries is a basis for the follow-up studies. Based on the survey of two urban major arteries in Nanjing, the general statistical methods were used to study the speed distribution characteristics of the basic sections of the two urban major arteries. First, the speed distribution forms of different types of the major arteries were qualitatively analyzed by fitting the survey data. Second, the central tendency and dispersion degree of the speeds were analyzed from the whole and transverse section aspects. The research results show that the speed distribution forms of the urban major arteries are mainly related to the driving freedom and traffic condition, the state of traffic flow would have different impaction on the speed distribution parameters. The results would provide a scientific basis and data support for planning, designing, controlling, manageing and evaluating of a urban main artery.