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Since Pennsylvania first introduced numbered traffic routes in 1924, a keystone symbol shape has been used, in reference to Pennsylvania being the "Keystone State". The signs originally said "Penna" (a common abbreviation for Pennsylvania at the time), followed by the route number in block-style numbering in a keystone cutout.
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.
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).
Pennsylvania Route 29 (PA 29) is a 118-mile-long (190 km) north–south state highway that runs through most of eastern Pennsylvania. The route currently has a southern and northern segment. The southern segment runs from U.S. Route 30 (US 30) near Malvern north to Interstate 78 (I-78)/ PA 309 near Allentown .
NY 17 is briefly in Pennsylvania in the borough of South Waverly: US 222: 90: 140 US 222 in Fulton Township: 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
Pennsylvania Route 8 (PA 8) is a major 148.6-mile-long (239.1 km) state route in western Pennsylvania. Officially, PA 8 is named the William Flinn Highway . Its southern terminus is at Interstate 376 (I-376)/ U.S. Route 22 (US 22)/ US 30 in Pittsburgh .
Pennsylvania Route 23 (PA 23) is an 81.14-mile-long (130.58 km) state highway in southeastern Pennsylvania.The route begins at PA 441 in Marietta and heads east to U.S. Route 1 (US 1) at City Avenue on the border of Lower Merion Township and Philadelphia.
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.