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U.S. Route 20 (US 20) is an east–west United States Numbered Highway in Pennsylvania, which clips the northwestern corner of the state, running entirely in Erie County. While it is part of the nation's longest road, it features the shortest segment of any two-digit U.S. Route in the commonwealth.
The "0" in its route number indicates that US 20 is a major coast-to-coast route. Spanning 3,365 miles (5,415 km), it is the longest road in the United States, [ 1 ] and, in the east, the route is roughly parallel to Interstate 90 (I-90), which is the longest Interstate Highway in the U.S.
The original Pennsylvania Route 3 was the designation for the William Penn Highway running from Hanover Township to Easton.After its decommissioning in 1930, PA 3 was renumbered in several areas to extend active routes, including US 22 from the WV/PA state line to Harrisburg, PA 60 from Robinson Township to Pittsburgh, US 322 from Harrisburg to Hershey, US 422 from Hershey to Wyomissing, US ...
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.
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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: US 322 near Boalsburg: 1985: current Former route of US 322 through State College and Boalsburg that was replaced by an expressway US 322 Truck: 4: 6.4 US 30 Bus./US 322 in Downingtown: US 30 Bus./
The Pennsylvania State Route System was established by the Sproul Road Bill passed in 1911. The system took control of over 4,000 miles of road. The system of roads continued to grow over the next few decades until continual addition of roads faced greater opposition.
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