本文以可接受间隙理论为基础 ,利用概率论方法 ,对以 1型车 ,2型车 ,… ,r型车等r种代表车型组成的混合车流进行分析 .建立了无信号交叉口支路混合车流穿越主路m条车道 ,每一车道的交通流车头时距服从不同强度的M3分布的通行能力模型 ,发展了无信号交叉口单一车型、单一车道车流理想条件的通行能力理论 . Based on the theory of acceptable clearance and using the probability theory, this paper analyzes the hybrid traffic flow composed of r representative vehicles, such as type-1 vehicles, type-2 vehicles, ..., r-type vehicles, etc. A branch road mixing Traffic flow through the main road m lanes, each lane traffic flow head time to comply with the different strength of the M3 distribution capacity model, the development of a signal-free intersection single car type, single lane traffic ideal conditions of capacity theory.