1998 Buick Riviera Owner's Manual - Page 17

But don't have a seatback reclined if your vehicle is moving. Sitting in a reclined position when your vehicle is in motion canbe dangerous. Evenif you buckle up, your safety belts can't do their job when you're reclined like this. The shoulder belt can't its job. In a crashyou do could go into it,receiving neck or other injuries. The lapbelt can't do its either. In a crash the job belt couldgo up over your abdomen. The belt forces would be there, not your pelvic bones. at This could cause serious internal injuries. For properprotection when the vehicle is in motion, have the seatback upright. Then sit well back in the seat and wear your safety belt properly. 1-6