Automotive vehicles (ATS) are divided into freight, passenger, special, and also – for travel, designed for use on roads shared network to off road, for use outside total road network. The cargo road transport vehicles (rolling stock) are trucks, tractors, trailers and trailer-dissolution. For passenger vehicles – buses, cars, passenger trailers. The special – vehicles for the production of a certain type of work fire trucks, cranes, cleaning cars, shop trailer, garbage trucks, cars equipped with different settings, etc. This handbook deals only with goods and certain specific exchanges. Trucks and tractors differ in engine type, body type and total mass, trailers – for loading height, the length of the loading platform and the total mass. Cars-tractors are designed for continuous operation with a trailer or semi-trailers and are divided into units (or side) for Work with trailers and tractors to work with semi-trailers. To increase the coupling weight can be applied to the ballast (ballast tractors).

Trailer called the vehicle is not equipped with motor and designed to travel as part of the towing vehicle. Trailer and trailer-towing vehicle connected to the dissolution of the trailer coupling, transmitting traction (push) and control efforts, which result from the interaction train links. Semitrailer is connected to the tractor fifth wheel (SSA), the transmitting traction and control efforts, and perceiving the vertical force from the mass of the trailer. Trailers and semitrailers, satisfy the requirements of state and industry standards, and norms of the transport legislation referred to as trailing vehicles for general use.