Tuscarora Mountain Tunnel is one of four original Pennsylvania Turnpike

Pennsylvania Turnpike

The Pennsylvania Turnpike is a toll highway system operated by the Pennsylvania Turnpike Commission in the Commonwealth of Pennsylvania, United States. The three sections of the turnpike system total . The main section extends from Ohio to New Jersey and is long...

 tunnel

Tunnel

A tunnel is an underground passageway, completely enclosed except for openings for egress, commonly at each end.A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers...

s still in active use. A second tube was bored in the late 1960s to ease traffic conditions. The Tuscarora Mountain tunnels measure 1.1 miles (1.7 km) in length and are the second-longest active tunnels on the Pennsylvania Turnpike system. The 1.3 mile (2.1 km) Sideling Hill Tunnel

Sideling Hill Tunnel

Sideling Hill Tunnel is one of three original Pennsylvania Turnpike tunnels abandoned after two massive realignment projects. The others are nearby Rays Hill Tunnel, and further west, the Laurel Hill Tunnel. It was less expensive to realign the Turnpike than to bore a second tube for four lane...

 is the longest overall, but was abandoned

Abandoned Pennsylvania Turnpike

The Abandoned Pennsylvania Turnpike is the common name of a 13 mile stretch of the Pennsylvania Turnpike that was bypassed in 1968 when a modern stretch opened to ease traffic congestion in the tunnels. In this case, the Sideling Hill Tunnel and Rays Hill Tunnel were bypassed, as was one of the...

 in 1968. Allegheny Mountain Tunnel

Allegheny Mountain Tunnel

The Allegheny Mountain Tunnel is a vehicular tunnel carrying the Pennsylvania Turnpike through the Allegheny Mountains. At this point, the Turnpike carries Interstates 70 and 76. The original Allegheny Mountain Tunnel was built in the late 19th century for the South Pennsylvania Railroad, which was...

is the longest in active use. The Tuscarora Mountain Tunnel sits on the Huntingdon/Franklin County line.