The influence of the difference in the height of the road junctions e.g. when crossing the viaduct (dilatation), it can cause de-balancing of a vehicle, especially in the corners/bends. In practice, this differences in height can reach amplitudes (high of differences two asphalt planes) from 1 cm to 3 cm, or even more. However, anything larger than 1 cm can already represents the critical vertical movement of the vehicle that in combination with the vehicle speed, bend radius, the roughness of the asphalt, dry / wet roads, etc. can lead in catastrophic accident – especially by trucks. This paper, thus present analysis of tests and simulation of such vehicle behaviour, and correlate them with the observations from real occurred traffic accidents, related to this topic. Also concrete cases are shown.