Introduction (2)Bus:Length of 3.5m Minibus;Length between 3.5m and 7m Light bus;Length between 7m and 10m Medium bus; Length between 10m and 12m Motorbus;length greater than12m or double-deck coach length between 10m and12m extended bus. (3)Truck:Total mass less than 1.8t -Mini truck;Total mass between 1.8t and 6t Light truck;Total mass between 6t and 14t medium truck;Total mass greater than 14t Heavy-duty goods vehicle (4)Towing vehicle Exclusively or mainly used to tow trailers. 2.1.2 Special car:Design or modification cars according to special requirements.Notably used to complete the work other than transportation. 机被电子工程学膜 Automobile and Tractor Northwest A&F UniversityAutomobile and Tractor Northwest A&F University Introduction (2) Bus: Length of 3.5m － Minibus; Length between 3.5m and 7m － Light bus; Length between 7m and 10m － Medium bus; Length between 10m and 12m － Motorbus; length greater than12m or double-deck coach length between 10m and12m － extended bus. (3) Truck: Total mass less than 1.8t － Mini truck; Total mass between 1.8t and 6t － Light truck; Total mass between 6t and 14t － medium truck; Total mass greater than 14t － Heavy-duty goods vehicle . (4) Towing vehicle : Exclusively or mainly used to tow trailers. 2.1.2 Special car: Design or modification cars according to special requirements. Notably used to complete the work other than transportation