Abstract: In order to depict waiting delay characters of mixed traffic flow at an unsignalized intersection, this paper sets up the waiting delay formula of mixed traffic flow composed of two representative types of vehicles. On the ground of analysis on some flaws of recent studies on unsignalized intersection, the paper bases on the gap acceptance theory, sets up the waiting delay formula of mixed traffic flow composed of two representative types of vehicles at an unsignalized intersection, then analyzes the relation between the waiting delay of the minor flow and the volume of the main flow, the proportion of various kinds of vehicles of the minor flow by selecting appropriate data of parameters of the formula.The result shows that the formula accords with the actual traffic flow condition at an unsignalized intersection.

Key words: unsignalized intersection, gap acceptance theory, mixed traffic flow, waiting delay

摘要： 为了描述无信号交叉口混合车流的等待延误特性，论文建立了由大小两种车型构成的混合车流的等待延误公式。本文在分析了目前无信号交叉口延误研究方法存在某些不足的基础之上，以可接受间隙理论为基础，建立了无信号交叉口大小两种车型构成的次要车流的等待延误公式。通过选取适当的参数数据，分析了次要车流等待延误与主要车流流量、次要车流不同车型比例构成的关系，结果表明该公式较为符合无信号交叉口实际情况。

关键词: 无信号交叉口, 可接受间隙理论, 混合交通流, 等待延误