Traffic safety facilities play an important role in ensuring traffic safety and reducing the degree of potential accidents. A good safety facility system should have many functions such as traffic management, safety protection, traffic guidance, isolation and closure, glare prevention, etc. In order to prevent traffic accidents, ensure smooth traffic and give full play to the functions of roads, traffic safety measures must be set up. According to the needs of traffic flow and the terrain and features, pedestrian bridges (including underground crosswalks), fences, lighting facilities, sight guidance signs, emergency contact facilities and other similar facilities should be set up on roads when necessary.