1. The basic design wind speed should be based on the local flat, open ground, 10m above the ground, with a return period of 50 years and an average maximum wind speed over 10 minutes, and should not be less than 22m/s.
2. The structure of traffic signs should be designed according to the ultimate limit state and serviceability limit state, and should simultaneously meet the requirements of construction and technology.
3. The structural importance coefficient of traffic signs can be divided into two levels:
(1) For cantilever and gantry-type traffic signs located on expressways and Class I highways, the structural importance coefficient is:
(2) For other types of traffic signs located on expressways and Class I highways, and traffic signs located on other grades of highways, the structural importance coefficient Y0 = 0.9. 4. The load calculation and combination, limit state design method, and foundation design of traffic sign structures shall comply with the provisions of the current "General Specifications for Highway Bridge and Culvert Design" (JTC D60), "Specifications for Highway Bridge and Culvert Foundation Design" (JTJ 024), "Specifications for Steel Structure Design" (JB 50017), and "Road Traffic Signs and Markings" (JB 5768).
