What does the total mass of a vehicle mean?

[KalebLynn]

The total mass of a vehicle refers to the weight when the vehicle is fully equipped and loaded with passengers (including the driver) and cargo as specified. The determination of a vehicle's total mass: 1. For passenger cars, the total mass equals the curb weight plus the weight of the driver and passengers plus the luggage weight; 2. For buses, the total mass equals the curb weight plus the weight of the driver and passengers plus the luggage weight plus the accessory weight; 3. For trucks, the total mass equals the curb weight plus the weight of the driver and assistant plus the luggage weight. The curb weight of a vehicle refers to the weight when the vehicle is fully equipped according to factory technical conditions, including items like the spare tire and tools, and with all fluids filled.