What is the meaning of a circular traffic prohibition sign featuring a red border, white background, black bold digits, and the unit 't' (e.g., '10t')?

1. Restriction on Gross Vehicle Mass: prohibits any vehicle whose total loaded mass exceeds the indicated tonnage from passing
2. Restriction on Axle Load: prohibits vehicles whose single axle weight exceeds the indicated tonnage
3. Minimum Speed Limit: indicates vehicles must maintain a speed above 10 km/h
4. Toll Payment Zone: indicates vehicles must pay a 10-yuan fixed bridge toll