Pontiac 1999 Firebird - Manual (Page 53)

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Larger Children Children who have outgrown child restraints should
wear the vehicle’s safety belts.
Accident statistics show that children are safer if they
are restrained in the rear seat. But they need to use the
safety belts properly.
D Children who aren’t buckled up can be thrown out
in a crash.
D Children who aren’t buckled up can strike other
people who are.