Chevrolet 2008 Silverado 1500 Pickup Owner's Manual page 28

Q:
What is wrong with this?
A:
The belt is over an armrest.
1-24
CAUTION:
{
You can be seriously injured if your belt goes
over an armrest like this. The belt would be
much too high. In a crash, you can slide under
the belt. The belt force would then be applied
on the abdomen, not on the pelvic bones, and
that could cause serious or fatal injuries.
Be sure the belt goes under the armrests.