1, commonly used in the highway exit to use as an emergency exit, as well as all levels of road intersections, toll stations, roads, bridges, parking lots, stations, terminals, shopping malls, plazas, highway maintenance, hotel, residential, sports places, dangerous areas and road construction sites, meeting places and other places of temporary fences as road dividers, regional isolation, diversion, order some mention in the guide or book celebration occasions, or sports entertainment and other rodeo occasions maintenance. 2, the driver has a clear warning, people can reduce the extent of casualties when the car accident, a more secure protection. For a variety of activities play a major role is to prevent people turning to climb over. Improve security.