Abstract
In this paper, we formulated the concept of the process of hitting a car on a fence as a movement along a curved trajectory with a certain radius of curvature. Special attention was paid to the contact of parts of different stiffness (when modeling the fence, these are ground-stand contacts), since the stiffness of the spring added to the contacting surfaces directly depends on the stiffness of the bodies being contacted. When soft bodies contact, its rigidity may be small, which can lead to instability of the solution. Also, the critical deflection of the fence (the transverse deflection of the fence, equal to twice the value of the console departure), after which the beam is inevitably lowered along with the deviated posts and the vehicles move over the fence.