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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).
(One example is Pennsylvania Route 3, which uses a one-way pair of Quadrant Routes in Center City Philadelphia.) A different number can also be used to avoid conflicts between different types — for instance, signed Pennsylvania Route 380 is actually State Route 400, renumbered ca. 1973 when Interstate 81E was renumbered Interstate 380. The ...
Former route of US 220 in Centre County that was replaced by an expressway; partially concurrent with I-80 US 222 Bus. 12: 19 US 222 in Cumru Township: US 222 in Ontelaunee Township: 1977: current Former route of US 222 through the Reading area that was replaced by multiple expressways US 322 Bus. 9: 14 I-99/US 220/US 322 near State College
Pennsylvania Route 5: Lakes-to-Sea Highway; Pennsylvania Route 6: Old Monument Trail (after 1924) Pennsylvania Route 7: Roosevelt Highway; Pennsylvania Route 8: William Flinn Highway (after 1924) Pennsylvania Route 9: Yellowstone Trail, Chicago-Buffalo Highway; Pennsylvania Route 10: Buffalo-Pittsburgh Highway (1927) Pennsylvania Route 11 ...
In late 1926, the route from West Virginia to Philadelphia (using the new route west of Pittsburgh) was assigned US 30, while the rest of the Lincoln Highway and PA 1 became part of US 1. The PA 1 designation was gone by 1929, [ 13 ] but several branches from east to west— PA 101 , PA 201 , PA 301, PA 401 , PA 501 , and PA 601 —had been ...
However, when the initial numbers were assigned later that year, they were drawn on a 1947 map, and so the corridor across Northern Pennsylvania became part of I-84, while the Scranton–New York route became I-82. I-80 ran along the Pennsylvania Turnpike to Harrisburg, where it split into I-80S to Philadelphia and I-80N to New York. [3]
Interstate 81 (I-81) is a north–south Interstate Highway, stretching from Dandridge, Tennessee, northeast to Fisher's Landing, New York, at the Canada–United States border. In Pennsylvania , I-81 runs for 232.76 miles (374.59 km) from the Maryland state line northeast to the New York state line near Hallstead and is called the American ...
Interstate 78 (I-78) is a major east–west Interstate Highway stretching from Union Township, Lebanon County, Pennsylvania, in the west to the Holland Tunnel and New York City in the east. In Pennsylvania , I-78 runs for about 78 miles (126 km) from the western terminus at I-81 in Union Township east to the New Jersey state line near Easton in ...