GMC 1993 Safari Owner's Manual page 34

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and Safety Belts
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5. To make the lap part tight, pull down on the buckle end o f the belt as
you pull up on the shoulder belt.
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The lap part of the belt should be worn low and snug on the hips, just
touching the thighs. In a crash, this applies force to the strong pelvic bones.
And you'd be less likely to slide under the lap belt. If you slid under it, the
belt would apply force at your abdomen. This could cause serious or even
fatal injuries. The shoulder belt should go over the shoulder and across the
chest. These parts of the body are best able to take belt restraining forces.
The safety belt locks if there's a sudden stop or a crash.
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