According to field data surveyed on one-track road with the most mixed traffic,it was proved by the method of multi-factor variance analysis that the motor vehicle flow,the opposite motor vehicle flow,the non-motor vehicle flow and the cross walk interference all affected the motor vehicle flow speed significantly.A general link performance function of motor vehicle with mixed traffic was extended from the BPR model,and then the variables were selected and the parameters were calibrated by field data.Thus,c...