To meet the above requirement, it m

To meet the above requirement, it must be ensured that for any Y-section, the frontend has at least 130 mm of air with respect to the AZT barrier in its initial position. Air is understood as any region of space that will occupy a null space in X with the advancement of the AZT barrier before causing displacement of the frontend. It is not necessary that the lower region of the frontend meet this requirement if it is achieved that its displacement does not cause a displacement in the upper region of the frontend. In particular, a minimum of 130mm of air is required between the bumper and the frontend (typically 80mm between the bumper and the bumper cross member, and 50mm between the bumper cross member and the frontend). If collapsible elements are used to comply with the above requirements, it is necessary to guarantee that their real behavior corresponds to the behavior observed in the finite element simulations through the checks deemed appropriate. Compliance with the above requirements by breaks occurring in areas not specifically designed to break is considered invalid