What is the legal basis for penalizing uncovered transport vehicles?

[Barnes]

The penalty is based on the "Urban Appearance and Environmental Sanitation Management Regulations" promulgated by the State Council. Ordinary transport vehicles: Include flatbed trucks and container vehicles, mainly transporting daily ordinary products such as electronic appliances, food, beverages, clothing, machinery, etc. Constant temperature or insulated vehicles: Used for food products with less stringent temperature requirements, generally maintaining temperatures around 5-10 degrees. Insulated vehicles are suitable for products with higher temperature requirements, such as pharmaceuticals, frozen foods, etc. Supervised vehicles: Used for transportation between supervised warehouses, mostly utilized near airports and docks, rarely used for ordinary cargo transportation.