<P> Interstate construction led the state to focus on other highways in Nebraska, as well . Surfaced shoulders, new safety sections beyond shoulders and other developments across the state were attributed to the influence of the Interstate . The 1965 state legislature also authorized a study of the needs of every public road in Nebraska, including state highways, county roads, and city streets . </P> <P> The following are speed limits that have existed on I - 80 in Nebraska since it was opened in 1957 . </P> <Table> Rural speed limits on I - 80 <Tr> <Th> Year </Th> <Th> Speed limit (s) </Th> </Tr> <Tr> <Td> 1960 </Td> <Td> 70 mph (115 km / h) </Td> </Tr> <Tr> <Td> 1964 </Td> <Td> 75 mph (120 km / h) for cars and 65 mph (105 km / h) for trucks </Td> </Tr> <Tr> <Td> </Td> <Td> 55 mph (90 km / h) national speed limit, effective March 3, 1974 </Td> </Tr> <Tr> <Td> </Td> <Td> 65 mph (105 km / h) </Td> </Tr> <Tr> <Td> 1995 </Td> <Td> 75 mph (120 km / h) </Td> </Tr> </Table> <Tr> <Th> Year </Th> <Th> Speed limit (s) </Th> </Tr>

What is the speed limit on the interstate in nebraska