The approved quality is the audit and regulation of the maximum loading quality allowed by the traffic management authorities for vehicles driving on dry and hard roads. For motor vehicles standardized or imported by the state, the loading quality shall be verified according to the original vehicle instruction manual.

For modified motor vehicles, the load mass should be determined with reference to engine power, chassis strength, tire load capacity and original vehicle mass, and the minimum value should be taken; For trailer loading quality, refer to the method of modified car for verification.

The rated passenger capacity refers to the sum of the number of seats in the carriage and the rated number of stations. Also known as the guest. Calculation of ordinary rated passenger capacity.

The calculation formula of rated passenger capacity is: passenger capacity = the number of fixed passenger seats in the carriage+the effective standing area of the carriage (square meter) × the number of allowed stations per square meter.