Controlled deformation zone
The purpose of the controlled deformation zone is to uniformly divide the energy generated by an impact. The car's bodywork must be stable and should have a fixed structure (thus providing passive safety).
The front and the rear sides of the car must have the so-called "crumple zones". When the front and the rear sides of the car are deformed, a part of the kinetic energy is stored by the bodywork. Thus, the passengers are protected during an impact. During the so-called "crash-test", these crumple zones are also tested.