<Tr> <Td> Wisconsin </Td> <Td> Primary Enforcement </Td> <Td> December 1, 1987 </Td> <Td> Age 8 + in all seats </Td> <Td> $10 </Td> <Td> 79.2% </Td> </Tr> <Tr> <Td> Wyoming </Td> <Td> Secondary Enforcement </Td> <Td> June 8, 1989 </Td> <Td> Age 9 + in all seats </Td> <Td> $25 for driver; $10 for passenger </Td> <Td> 78.9% </Td> </Tr> <P> 1 Colorado and Missouri's law is Secondary for adults but Primary for under the age of 16 . </P> <P> Idaho, North Dakota, Pennsylvania, Vermont and Virginia's law is Secondary for adults but Primary for under 18 . </P>

Why is it law to wear seat belts