Oldsmobile 2001 Silhouette - Manual (Page 18)

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But don’t have a seatback reclined if your vehicle
is moving.
CAUTION:
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 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.