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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 ...
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.
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).
Route description. US 11 enters Pennsylvania parallel to I-81 south of Greencastle in Antrim Township, Franklin County. The two routes head to the northeast, running parallel to each other as they pass through Chambersburg, where they intersect US 30, Shippensburg, and Carlisle. Northeast of Carlisle in Middlesex Township, US 11 has ...
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 northern segment runs from I-81 in Ashley north to the New York state line near Brookdale, Pennsylvania, where the road becomes New York State Route 7 (NY 7). The southernmost 5 miles (8.0 km) of PA 29's northern segment is a freeway known as the South Cross Valley Expressway. The route was continuous until May 9, 1966, when PA 29 was split ...