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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).
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.
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 Route 147, PA Route 405, PA Route 44, State Route 1007, State Route 2014, State Route 2016: 19 Water Street (LR 19/LR 240 - PA Route 405) and Main Street (LR 18 - State Route 2014) Muncy: Cliff Avenue (LR 17/LR 19 - U.S. Route 220) and Main Street (LR 17 - PA Route 42) Laporte: PA Route 405, U.S. Route 220, State Route 3015, U.S. Route 220: 20
Created when US 13 was rerouted to improve truck traffic US 15 Bus. 14: 23 Maryland state line in Freedom Township: US 15/PA 394 in Straban Township: 1964: current Original route of US 15 that was replaced by an expressway US 15 Bus. 4: 6.4 US 15/PA 660 in Richmond Township: US 15 in Richmond Township: 2005: current
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.
Interstate 81E; Interstate 81E (Pennsylvania) Interstate 81S; Interstate 82 (Pennsylvania–New York) Interstate 83; Interstate 83 Business (York, Pennsylvania) Interstate 283; Interstate 84 in Pennsylvania; Interstate 86 (Pennsylvania–New York) Interstate 90 in Pennsylvania; Interstate 95 in Pennsylvania; Interstate 295 (Delaware–Pennsylvania)
The route between US 30 in Breezewood and US 522 in Warfordsburg was originally known as Pennsylvania Route 126 (PA 126). In 1957, preliminary numbers were assigned; the longer route via Pittsburgh (now I-79 and I-376 ) became the main line of I-70, while the southern bypass (now I-70) became Interstate 70S ( I-70S ). [ 5 ]