2003 Buick Regal Owner's Manual - Page 11

.:on when your vt..-cle Sitting in a reclined Po:-. is in motion can be dangerous. Even if 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, it will be 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 couldgo 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 wear your safety belt properly. But don't have a seatback reclined if your vehicle is moving. 1-4