A traffic sign is a road device that uses words or symbols to convey a message of guidance, restriction, warning or indication. Also known as road signs, road traffic signs. In the traffic signs is generally a safe, eye-catching, clear, bright traffic signs is the implementation of traffic management, to ensure road traffic safety, smooth important measures. There are many types of traffic signs, which can be divided into main signs and auxiliary signs in various ways. Movable marks and fixed marks; Lighting signs, luminescent signs and reflective signs; And variable information signs that reflect the changing driving environment.