The bogie undulation movement is highly important both for the stability of the vehicle, therefore for traffic safety, and for ensuring transversal comfort. The establishment of the traffic speed is essential, in which the stable movement of the vehicle shall transform into an instable movement, namely the establishment of the critical speed, which, once exceeded, results in a quick worsening of traffic. Thus, the maximum speed to be safely attained by a vehicle is actually determined. An improvement in the transversal stability of the bogie and, respectively, an increase in the critical speed may be obtained by a proper construction of the vehicle.