2008 GMC Sierra 1500 Pickup Owner's Manual - Page 59

{CAUTION: Frontal airbags are designed to deploy in moderate to severe frontal and near frontal crashes. They are not designed to inflate in rollover, rear crashes, or in many side crashes. Rollover capable roof-rail airbags are designed to inflate in moderate to severe crashes where something hits the side of your vehicle, during a vehicle rollover, or in a severe frontal impact. They are not designed to inflate in rear crashes. Everyone in your vehicle should wear a safety belt properly - whether or not there is an airbag for that person. {CAUTION: Airbags inflate with great force, faster than the blink of an eye. Anyone who is up against, or very close to, any airbag when it inflates can be seriously injured or killed. Do not sit unnecessarily close to the airbag, as you would be if you were sitting on the edge of your seat or leaning forward. Safety belts help keep you in position before and during a crash. Always wear your safety belt, even with airbags. The driver should sit as far back as possible while still maintaining control of the vehicle. Occupants should not lean on or sleep against the door or side windows in seating positions with roof-rail airbags. 1-55