Security guards perform traffic enforcement by managing traffic flow in private areas, such as parking lots and event venues, and can direct vehicles, set up barriers, and control access points.   

Their ultimate goal is to promote public safety and ensure adherence to traffic rules for both moving and parked vehicles. 

However, security guards do not have the same authority as law enforcement and cannot perform traffic stops or make arrests on public roads, as they operate within the boundaries of a specific property or event.