<Tr> <Td> ← I - 279 </Td> <Td> I - 280 </Td> <Td> PA 280 → </Td> </Tr> <Tr> <Th_colspan="2"> Pennsylvania Historical Marker </Th> </Tr> <Tr> <Th> Designated </Th> <Td> </Td> </Tr> <P> The Pennsylvania Turnpike is a toll highway operated by the Pennsylvania Turnpike Commission in the U.S. state of Pennsylvania . A controlled - access highway, it runs for 360 miles (580 km) across the state . The turnpike begins at the Ohio state line in Lawrence County, where the road continues west into Ohio as the Ohio Turnpike . It ends at the New Jersey border at the Delaware River--Turnpike Toll Bridge over the Delaware River in Bucks County, where the road continues east as the Pearl Harbor Memorial Extension of the New Jersey Turnpike . </P>

When were the tunnels built on the pa turnpike