关键词: 路阻函数, 行驶车速, 交通负荷, 间断车流

Abstract: A semi-theoretical and semi-experimental impedance function is presented on the basis of the characteristic of mixed traffic in our country.In this impedance function,the theoretical model of relationship between ruuning speed and vehichlar traffic load is established by means of the relationship of three parameters in traffic flow theory,and this model is modified according to the influences of discontinuation of traffic flow,interference of bicycles,interference of pedestrians and width of lanes.The influence of discontinuation of traffic flow is emphatically discussed,the five running models of discontinuous flow and the calculation methods of occurrence probability,average running speed are presented.

Key words: impedance function, running speed, traffic load, discontinuous flow