The complexity of this study conducted by the authors in this paper is intended to be a systemic approach to road side impact event in generally and influence of the deformation amplitude on the conditions of survival of the victims in special. Therefore, in this paper there are presented models for determining the pulse collision and the speed variation of the vehicle during the collision. Also, the principal direction of force (resultant force) respectively the collision occupant behavior in this stage are determined. Impact initiation and post-crash phase are controlled by a network of sensors commonly used in passive vehicle safety system. The execution elements provide information on driving conditions and the position of occupants in the vehicle. The information is extremely useful to expert investigators who activates in the field of the traffic events investigation and reconstruction.