<Tr> <Td> Puerto Rico </Td> <Td> 65 mph (105 km / h) </Td> <Td> 55 mph (89 km / h) </Td> <Td> - </Td> <Td> - </Td> <Td> 35--55 mph (56--89 km / h) </Td> <Td> 35 mph (56 km / h) </Td> </Tr> <Tr> <Td> Rhode Island </Td> <Td_colspan="2"> 65 mph (105 km / h) </Td> <Td> 50--55 mph (80--89 km / h) </Td> <Td> 55 mph (89 km / h) </Td> <Td> 50 mph (80 km / h) </Td> <Td> 20--25 mph (32--40 km / h) </Td> </Tr> <Tr> <Td> South Carolina </Td> <Td_colspan="2"> 70 mph (113 km / h) </Td> <Td> 55--70 mph (89--113 km / h) </Td> <Td> 55--65 mph (89--105 km / h) </Td> <Td> 45--55 mph (72--89 km / h) </Td> <Td> 20--30 mph (32--48 km / h) </Td> </Tr> <Tr> <Td> South Dakota </Td> <Td_colspan="2"> 75--80 mph (121--129 km / h) </Td> <Td> 55--65 mph (89--105 km / h) </Td> <Td> 65--70 mph (105--113 km / h) </Td> <Td> 55--65 mph (89--105 km / h) </Td> <Td> 20--45 mph (32--72 km / h) </Td> </Tr>

Highway in the us with no speed limit