There will always be a persons who will not listen to warnings. The seatbelt warning message must be repeated often through many different venues.
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There are many ways to begin a well organized national safety campaign with the aim of teaching seatbelt safety to children.
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A concerned and loving mother watching. Then pictures of children fastening seat belts and saying "click-it" in various languages. Finishing up with an authoritative person saying... "The sound of fastening your seatbelt is the same in all languages."