Pontiac 2002 Firebird - Manual (Page 54)

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CAUTION:
Never do this.
Here two children are wearing the same belt.
The belt can’t 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.
Q:
What if a child is wearing a lap - shoulder belt,
but the child is so small that the shoulder belt is
very close to the child’s face or neck?
A:
Move the child toward the center of the vehicle,
but be sure that the shoulder belt still is on the
child’s shoulder, so that in a crash the child’s upper
body would have the restraint that belts provide.