1. Warning sign: a sign warning vehicles and pedestrians to pay attention to dangerous places.
2. Prohibition signs: signs that prohibit or restrict the traffic behavior of vehicles and pedestrians.
3. Indicating signs: signs indicating the movement of vehicles and pedestrians.
4. Guiding signs: signs that convey information about road direction, location and distance.
5. signs of tourist areas: signs that provide the direction and distance of tourist attractions.
6. Road construction safety sign: a sign announcing the passage of the road construction area. Auxiliary sign: a sign attached to the main sign to help explain. The outer edge of the road traffic sign frame has a background color. The provisions of background color are: warning sign yellow, prohibition sign white, indication sign blue,
The road signs of expressways and urban expressways are green, and the road signs of other roads are blue.