The semi-trailer of Laiwu Steel City takes photos at night. The ban on trucks was changed from tonnage to vehicle type. At present, the tonnage of freight vehicles is defined (with 2 tons as the boundary), and some manufacturers use legal loopholes to produce 1.99-ton medium-sized trucks (the container length and capacity meet the standard of medium-sized trucks), which affects the management effect. The purpose of this bulletin is to clearly define the types of trucks and vehicles. Light and mini trucks correspond to blue trucks, and heavy and medium trucks correspond to yellow trucks, which is convenient for identification and management.