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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.
Harrisburg, PA: Pennsylvania Department of Transportation; Traffic and State Route Map, Allegheny County (PDF) (Map) (2016 ed.). Cartography by PennDOT Bureau of Planning and Research, Geographic Information Division, in cooperation with the Federal Highway Administration.
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.
Interstate Highways make up three percent of all roadway lane miles in Pennsylvania and have a combined length of 1,953 mi (3,143 km) within the state. Twenty-four percent of all vehicle traffic is on the Interstate System. [1]
The Highway Administration deputate oversees 39,737 miles (63,951 km) of roadway and 25,400 bridges in Pennsylvania which comprise the Pennsylvania State Route System. The deputate is made up of over 9,300 employees in design, construction, maintenance, materials testing, environmental review, safety, and traffic engineering.
Rather, the system is a navigational aid for motorists in unfamiliar portions of the county. [1] Five routes were introduced in the early 1950s: from outermost to innermost, the Red, Orange, Yellow, Green, and Blue Belts. The Purple Belt was added later. All roads in the system retain their original names.
Approaching Avondale, the Baltimore Pike traffic bent southeast along Pennsylvania Avenue , then the Baltimore Pike split off after Avondale. In the town of Kennett Square, northbound US 1 ran along Cypress Street while southbound US 1 ran along State Street, and those streets were marked east to west, not north to south.
In 1974 and 1975, work commenced on the final sections from PA 307 to the Shutters Road underpass and Shutters Road to PA 435, respectively. [8] This included an interchange with I-84, and was opened to traffic in 1976 as an east–west highway with mileage-based exit numbers. [8]