If the rear bench seat/rear seat and seat backrest are not engaged, they could fold forwards, e.g. during sudden braking or in the event of an accident.
If this were the case, the vehicle occupant would be forced into the seat belt by the rear bench seat/rear seat or by the seat backrest. The seat belt would not be able to provide the intended protection and could cause additional injury.
Objects or loads in the boot cannot be restrained by the seat backrest.
Both seat backrests can be folded forwards separately.