Abstract: The minor approach at unsignalized intersection usually has different lane use allocations,however,the maximum capacity of mixed traffic flow on which can't be effectively calculated out by any other current method.Based on gap acceptance theory and probability theory,the capacity of different lane uses such as through-left,through-right etc are discussed. After analyzing the probable queue type consisting of different turning movements and different vehicle types,the capacity model of different lane use group in minor approach is set up,and the main traffic headway must be in accordance with the negative exponent distribution.Therefore,the capacity theory of unsignalized intersection with mixed traffic stream is improved,and theoretical base of the traffic management in urban city is provided.

Key words: unsignalized intersection, gap acceptance theory, lane use allocation, capacity

摘要： 无信号交叉口的次要道路往往有不同的车道功能划分组合,现有的通行能力计算模型不能真正解决混合交通流在其上的最大通过能力计算问题。以可接受间隙理论为基础,利用概率论方法,对直左、直右等合用车道功能组的通行能力计算模型进行了探讨,通过对小型车、大型车构成的混合车流在不同合用车道上的转向队型分析,建立了该类交叉口主路车流服从负指数分布下的支路通行能力模型,从而发展了无信号交叉口的混合车流通行能力理论,为现代化的城市、公路交通管理提供了理论依据。

关键词: 无信号交叉口, 可接受间隙理论, 车道功能划分, 通行能力