GMC Acadia 2011 Owner's Manual page 78

3-24 Seats and Restraints
Q: What is wrong with this?
A: The belt is behind the body.
WARNING
You can be seriously injured by
not wearing the lap-shoulder belt
properly. In a crash, you would
not be restrained by the shoulder
belt. Your body could move
too far forward increasing the
chance of head and neck injury.
You might also slide under the lap
belt. The belt force would then
be applied right on the abdomen.
That could cause serious or fatal
injuries. The shoulder belt should
go over the shoulder and across
the chest.
Q: What is wrong with this?
A: The belt is twisted across
the body.