1. The designed weight limit for the first-class highway load of the bridge is 55t. 2. Load, customarily refers to various direct effects exerted on the engineering structure to produce effects on the engineering structure or components. Common ones include: structural self-weight, floor live load, roof live load, roof area dust load, vehicle load, crane load, equipment dynamic load, and natural loads such as wind, snow, ice, waves, etc. 3. First-class highways can generally accommodate an average annual day and night traffic volume of 10,000 to 25,000 vehicles converted from various cars (including motorcycles) into passenger cars. They are designed to connect important political and economic centers and lead to key industrial and mining areas, ports, Airport, a road dedicated to separate lanes for cars and partially controlled access.