Modelling of a vehicle for an “accurate” analysis of collision is a work that is not yet completely solved but we the use of the methodologies of “Soft Computing” useful answers are obtained. Modeling a person to study their movement during a collision represents an even more complex task, but the automotive industry is advancing in the most accurate description of the human body, in order to build ever safer vehicles. From the previous discussion, it can be concluded that try to get “exact” answers in collision problems, with elementary physics formulas, is vain and naive. Only inexperienced and non practical people intend to achieve this, forgetting that the classic analysis of collisions with rigid bodies represents only a first approximation of the problem, which however, with common sense, becomes a valuable tool in the search for truth and with the consideration of other evidence it can lead to clarification of the way in which a certain collision occurred.