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Among the most important operational properties of articulated buses, ensuring their safety, it is necessary to note the course stability of traffic (CST), as often the loss of CST of a vehicle is accompanied by an accident. The parameters of the CST of a road train are closely related to the design of the running gear, in particular to the skew of the bus and trailer axles. The critical speed of rectilinear traffic was determined for different states of the articulated buses running system, which, in the absence of a bridge skew, was 32.1 m/s (116.6 km/h). The movement of the SSA is asymptotically stable. Under the action of perturbation, the stabilization time for lateral velocity is about 1 s and it increases to 2 s for the folding angle, but the amplitude of the backscatter of this angle is 10 times less than the initial perturbation, which indicates a stable asymptotic law of its change at small amplitude.

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The vehicle oscillates in different planes relative to the three axes while driving. Especially important are the turns of the vehicle by dint of steered wheels. During such highspeed turns, the vehicle is subjected to additional charges of various systems, including the control system. Therefore, in the calculations of the control system of the vehicle, it is necessary to take into account the inertial mass of the vehicle. In general, the inertial characteristics of some solid body during its rotation are determined by the moments of inertia of this body. The moment of inertia of a solid body concerning the axis of rotation is simply the mass times the square of the perpendicular distance to the rotation axis. To test the results obtained by means of the analytical method, it is necessary to determine the moment of inertia of a vehicle in an experimental way. A convenient method of measuring the moment of inertia of a vehicle can be the method of torsional vibrations. The moment of inertia of a vehicle was determined using special equipment, which was constructed in the laboratory of the Department of Motor Vehicles of the National Transport University.