The author has already studied original methodologies especially suited for evaluating the kind and seriousness of injuries in a road accident, including a practical method for data acquisition. One such methodology consists of calculating the relationship between the number of injuries in a single person run over by a car and the number of people we know who have suffered injuries (Coefficiente di Ripetibilità Lesiva:​ CRL = n.l./n.t.). Such a relationship can be considered as "Seriousness Injuries Factor".

This meaning, which is generally accepted, is based on the evaluation by the traumatologist of any single minimum injury in an injured body related to the number of people injured. In a road accident, in which a pedestrian is involved, this methodology becomes more interesting and substantial because it outlines not only the number of injuries but also provides a practical indication about the parts of the human body which are more frequently involved. In the case of a car accident, the analysis of the injuries on the bodies of the occupants of the car points out that some well-identified parts of the body are more frequently involved than others because of the typical structure of the car. In the analysis of pedestrians, the multiple injuries are caused by a lot of factors which are related essentially with the collision trajectory, the type of vehicle and above all the speed;​ therefore the number of injuries is strictly dependent on the seriousness of the accident. This is of the maximum importance for the evaluation of the seriousness of the accident aimed to prevention needs. As a practical application, this methodology can be used for prevention purposes in a specific and well identified area of road accidents.