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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).
Butler Street, Bridge Street, Main Street, Freeport Road, Pittsburgh Street, Freeport Road, Seventh Avenue, Tenth Avenue, Freeport Road. PA Route 28 in Etna. Butler County. old PA Route 28. State Route 1002. PA Route 28 in O'Hara Township. SR 1001 in O'Hara Township. connection between new and old PA Route 28.
Pennsylvania Route 29. 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.
State. Scenic. Legislative. ← US 30. → PA 32. Pennsylvania Route 31 (PA 31) is a 74-mile-long (119 km) state highway located in Western Pennsylvania, paralleling U.S. Route 30 (US 30) and the Pennsylvania Turnpike for most of its length. The designation begins at PA 136 near West Newton and ends at US 30 near Bedford.
Pennsylvania Route 51 (PA 51) is a major state highway that is located in Western Pennsylvania in the United States. It runs for 89 miles (143 km) from Uniontown to the Ohio state line near Darlington, where it connects with Ohio State Route 14. PA 51 is the termination point for Pennsylvania Route 43, Pennsylvania Route 48 and Pennsylvania ...
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 ...