1) The design of traffic safety signs is based on the reference objects of foreign users who are unfamiliar with local road conditions, fully considers the convenience of traffic participants and the improvement of road traffic capacity, and comprehensively considers factors such as road facilities, vehicles, traffic environment and climate, etc. Meet the traffic safety management needs of local roads in Shenzhen. 2) Traffic safety signs should be placed on the right side of the road in the direction of travel or above the roadway. When the number of one-way lanes on the road is greater than or equal to 3, the traffic volume is large, there are many large vehicles, or the road alignment affects the visibility of the right sign, it should be set repeatedly on the left side of the vehicle's forward direction. The setting of traffic signs shall not affect the parking sight distance of the road. 3) The location and content of traffic safety signs should be able to make traffic participants pay attention and interpret them quickly. The location of traffic signs should consider factors such as road width, vehicle speed, and driver's reaction ability. Reasonable spacing shall be maintained between the signs and shall meet the requirements of relevant specifications. If it is really necessary to add new signs between signs that maintain small intervals, it is advisable to adopt the form of supporting structures that do not block each other. 4) The information conveyed by the traffic signs should firstly use patterns, followed by digital symbols, and then text information. 5) The information expressed by signs and markings should be complementary in content, corresponding or progressive in space, and should not produce contradictions and ambiguities.