GMC 2006 Envoy Owner's Manual page 13

CAUTION:
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Sitting in a reclined position when your vehicle
is in motion can be dangerous. Even if you
buckle up, your safety belts cannot do their
job when you are reclined like this.
The shoulder belt cannot do its job. In a
crash, you could go into it, receiving neck or
other injuries.
The lap belt cannot 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 wear your safety
belt properly.
Do not have a seatback reclined if your vehicle
is moving.
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