GMC 1999 Sierra 1500 Pickup Owner's Manual page 18

Seats & Safety Belts
Don't have a seatback reclined if your vehicle is moving.
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Sitting in a reclined positiin when your vehicle is in motion can. be
4
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
ov0f
your abdomen. The belt
forces would be there, not at your
petvic bones. This could
cause
serious internal injuries,
For proper protection when the vehicle is in motion, have the seat-
back upright. Then sit well
back
in the seat and
wear your
safety
belt properly.
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