See also:

Rear seats
WARNING Seatbelts provide maximum restraint when the occupant sits well back and upright in the seat. Do not put cushions or any other materials between occupants and seatbacks or seat cushions ...

Driving on grades
● Before going down a steep hill, slow down and shift into lower gear (if necessary, use 1st gear) in order to utilize the overheating of your vehicle’s brakes. Do not make sudden downshifts ...

Rear seats
Rear seats Seatbelts provide maximum restraint when the occupant sits well back and upright in the seat. Do not put cushions or any other materials between occupants and seatbacks or seat cushion ...