Buick 2003 Rendezvous Owner's Manual page 14

But don't have a seatback reclined if your vehicle is
moving.
Sitting in a reclined position when your vehicle
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 could go into
it,
receiving neck or other injuries.
The lap belt can't do it's 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 wear your safety belt
properly.
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