2003 GMC Safari Owner's Manual - Page 12

Head Restraints Sitting in a reclined position when your vehicle is inmotion can be dangerous. Evenif you buckle up, your safety belts can't do their job when you're reclined like this. The shoulder belt can't do its job because it won't be against your body. Instead, will be it in front of you. In a crash you couldgo into it, receiving neck or other injuries. The lap belt can't do its job either. In a crash the belt could go up over your abdomen. The belt forces would be there, not at your pelvic bones. This could cause serious internal injuries. For proper protection when the vehicle is in motion, have the seatback upright. Then sit well back in the seat and wearyour safety belt properly. Adjust your head restraint so that the top of the restraint is closest to the top of your head. This position reduces the chance o a neck injury in a crash. f 1-5