Proposal to ensure that only safe head restraints are fitted to seats of any seating position in all vehicle categories within the scope of UN R17 and to extend the test performance of paragraph 5.7.4 (height retention of head restraints) to non-adjustable head restraint with only one position of use.

Proposal to enable approval of all vehicles and seating positions with regard to the strength of seats and their anchorages and with regard to their head restraints (in addition to M₁ and N₁) under UN R17. (Note: WP.29 deferred a decision on adoption of this proposal during the November 2023 session.)