Vissim is a world-leading microscopic traffic flow simulation software provided by German PTV company. Vissim can easily build a variety of complex traffic environments, including highways, large roundabouts, parking lots, etc., and can also simulate the interaction behavior of vehicles, trucks, rail transit and pedestrians in a simulation scene. It is an effective tool for professional planning and evaluation of urban and suburban traffic facilities, and can also be used to simulate the impact of local emergency traffic, the evacuation of large numbers of pedestrians, etc.