Opel Blazer Operation & Maintenance Instructions Manual page 46

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.
CAUTION:
Wear your belt fitted closely against the body.
Do not wear your shoulder belt under your
arm. Make sure the belt is not twisted across
your body.
2-6