PASSENGER and side airbags are optional. A new, strengthened upper B-pillar reduces side impact velocity to head, neck and chest. The S uses a front structure designed around "soft pulse" crash energy management principles. The structure behind the front wheels has been designed to manage narrow offset collisions and reinforced side structures protect against side impacts. Seatbelt webbing clamps and buckle pretensioners assist safety belt performance. The driver's airbag has low pressure inflators designed to prevent injury from airbag inflation. Energy absorbing foam is used under the door trim to minimise side impact load (fitted where side impact airbags not fitted). Anti-submarining ramps in all seats reduce the risk of sliding under the seatbelt in a collision. The Commodore's systems turn off the engine and fuel pump, unlock the doors and switch on the dome lamp when the seatbelt pretensioners are triggered.