Abstract: Based on basic social force model, considering the interference of bikes on pedestrian, this paper presents a modified social force model to describe the interactions between bikes and pedestrians. By simulation, the influences of the setting cyclists' path on the number of pedestrians and bicycle accidents and the arrival rate of bicycles were analyzed; and then, the slipstreaming, self-organization and lane-forming of bicycle and pedestrian mixed flow were reproduced, which obeys the observed data. The simulation results show that setting of cyclists' path can effectively alleviate the conflicts of bicycles and pedestrians, and help to reduce the number of potential traffic accidents of pedestrian and bicycle mixed flow, thus, improving the operation efficiency of the mixed traffic flow. Comparison of the simulation results and the observed data proves the effectiveness of the modified model. Besides, conclusions are drawn that with the increase of bicycle traffic, setting the cyclists' path on the crosswalk becomes more beneficial. Furthermore, setting wider cyclists' path according to the bicycle volume can guarantee bicycles to cross the crosswalk with maximum speed. The simulation model enables us to visually represent pedestrian and cyclist collective phenomenon.

Key words: engineering of communications and transportation system, social force model, bike, pedestrian, mixed traffic flow