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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.
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. On October 1, 1940, the Pennsylvania Turnpike's first section of highway was ...
State. Scenic. Legislative. 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).
Interstate 80 (I-80) in the US state of Pennsylvania runs for 311.12 miles (500.70 km) across the central part of the state. It is designated as the Keystone Shortway and officially as the Z.H. Confair Memorial Highway. This route was built mainly along a completely new alignment, not paralleling any earlier US Routes, as a shortcut to the ...
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 23 begins at Marietta in Lancaster County and continues east to Lancaster, where it ...
The Pennsylvania Turnpike, sometimes shortened to Penna Turnpike or PA Turnpike, is a controlled-access toll road that is operated by the Pennsylvania Turnpike Commission (PTC) in the Commonwealth of Pennsylvania in the United States. It runs for 360 miles (580 km) across the state, connecting Pittsburgh in Western Pennsylvania with ...