Research of effects of accident on traffic flow characteristics

Based on the fluid mechanics theory of the traffic flow, the traffic flow parameters were specified, and the models of compressibility and viscosity of traffic flow were established respectively. Furthermore, the traffic flow on typical accident road was analyzed by the software ANSYS in order to reveal the effects of accident on the traffic flow characteristics. The results show that the velocity, pressure and density of traffic flow in the accident section changed greatly. In order to ensure the dredging of accident section and avoid secondary accident, the warning signs should be set up, and traffic control measurement such as limiting the traffic speed as well as restricting the traffic flow at the upstream and downstream of the accident section should be carried out.