Chevrolet 2000 Express Van Owner's Manual page 29

yellowblue
5. To make the lap part tight, pull down on the buckle The lap part of the belt should be worn low and snug on
end of the belt as you pull up on the shoulder belt. 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.
1-17