GMC T-Series 2007 Owner's Manual page 44

Q:
What is the proper way to wear safety
belts?
A:
If possible, an older child should wear a
lap-shoulder belt and get the additional
restraint a shoulder belt can provide.
The shoulder belt should not cross the face
or neck. The lap belt should fit snugly
below the hips, just touching the top of the
thighs. It should never be worn over the
abdomen, which could cause severe or
even fatal internal injuries in a crash.
According to accident statistics, children are safer
when properly restrained in the rear seating
positions than in the front seating positions.
In a crash, children who are not buckled up can
strike other people who are buckled up, or can be
thrown out of the vehicle. Older children need
to use safety belts properly.
44
CAUTION:
{
Never do this.
Here two children are wearing the same
belt. The belt cannot properly spread the
impact forces. In a crash, the two children
can be crushed together and seriously
injured. A belt must be used by only one
person at a time.