The type of materials of inertial elements were chosen in the way to be very close to the masses of the original objects. In the process of idealization 4 inertial elements were distinguished: body, front and rear axle and the driver’s seat. The elements are connected with each other by the elastic-damping elements. There are 11 EDE in the model: two shock absorbers, two springs, two vibration dampers, four tyres and the elastic-dumping element that connecting the car’s body with the seat. The directions of appropriate axes of local coordinates systems coupled at the centres of gravity of particular inertial elements and at the elastic-damping elements are parallel, as shown in Fig. 2. The coordinates systems coupled at the centres of gravity of particular inertial elements were also marked on the model, as well as the coordinate systems corresponding to the elastic-damping elements.