This standard applies to Vehicles of categories M1 and N with regard to the strength of seats and their anchorages
and with regard to their head restraints; Vehicles of categories M2 and M3 in respect of the strength of seats and their anchorages, and in respect of their head restraints; as for Vehicles of category M1 with regard to the design of the rear parts of seat backs and the
design of devices intended to protect the occupants from the danger resulting from the displacement of luggage in a frontal impact.