27. The front seats in a low-speed vehicle must be equipped with a cushioned headrest that can reach a minimum height of 770 mm measured along the backrest, from the base of the seat to the top of the headrest. If the inside height of the vehicle makes it physically impossible for the headrest to reach the prescribed minimum height, the distance between the top of the headrest and the roof must not exceed 25 mm.
The front seats’ headrests may also be fastened to the side wall of the passenger compartment. In such case, they must be fastened right above the back of the seat and meet the conditions provided for in the first paragraph. They must also be adjustable lengthways.
Where a headrest is adjustable, it must be designed so as to remain in the chosen position, even in case of impact.