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The list of Interstate Highways in Pennsylvania encompasses 23 Interstate Highways—12 primary routes and 11 auxiliary routes—which exist entirely or partially in the U.S. state of Pennsylvania. In Pennsylvania, most of the Interstate Highways are maintained by the Pennsylvania Department of Transportation (PennDOT).
PA Routes are also called Pennsylvania Traffic Routes, and formerly State Highway Routes. [ 2 ] There are 41,643 mi (67,018 km) of roadway maintained by state agencies, with 39,737 mi (63,951 km) maintained by PennDOT, 554 mi (892 km) maintained by the Pennsylvania Turnpike Commission , and 1,352 mi (2,176 km) maintained by other state agencies.
PA 8: One of the longest Pennsylvania state routes, this highway's southern terminus is located in Wilkinsburg, at an interchange with Interstate 376. The road then forms that borough's main street as Ardmore Boulevard, before entering Pittsburgh city limits. As the busy Penn Avenue and Washington Boulevard, the highway is a backbone of the ...
U.S. and Interstate highways are classified as state routes in Pennsylvania. The Commonwealth of Pennsylvania established the Location Referencing System (LRS) in 1987, which registers all numbered routes in Pennsylvania as SR-X. A state route would be SR 39, a US Route would be SR 22, and an Interstate route would be SR 80.
PennDOT states interstates 90 and 86 are now open in Erie County with other roadways and routes closed or under restrictions.
0–9. Interstate 495 (Pennsylvania 1956–1958) Interstate 67 (Pennsylvania) Interstate 70 in Pennsylvania; Interstate 70S (Pennsylvania) Interstate 176
I-78/PA 222/PA 309 in Dorneyville, PA: 1926: current US 224: 10: 16 US 224 in Mahoning Township: PA 18 in New Castle: 1933: current US 230: 40: 64 US 22 in Harrisburg: US 30 in Lancaster: 1928: 1967 Now PA 230 and PA 283: US 309: 138: 222 US 611 in Philadelphia: US 6 in Tunkhannock: 1926: 1968
The highway passes through a corner of Greene Township prior to entering Millcreek Township, where it has an exit for PA 8. The roadway briefly crosses back into Greene Township before it heads into Harborcreek Township. Here, I-90 has an interchange with PA 290/PA 430 that provides access to Penn State Erie, The Behrend College.