List of state routes in Pennsylvania

Pennsylvania State Route System
Pennsylvania State Route System
	State route markers in Pennsylvania.
System information
Notes	All routes are assigned State Route (SR X) numbers, usually corresponding to the signed numbers. State Routes are generally state-maintained.
Highway names
State	Pennsylvania Route X (PA X)
Special Routes:	Pennsylvania Route X Alternate (PA X Alt.);; Pennsylvania Route X Alternate Truck (PA X Alt. Truck);; Pennsylvania Route X Business (PA X Bus.);; Pennsylvania Route X Bypass (PA X Byp.);; Pennsylvania Route X Truck (PA X Truck);
Quadrant Routes:	State Route X (SR X)
System links
	Pennsylvania State Route System; Interstate; US; State; Scenic; Legislative;

The Pennsylvania Department of Transportation (PennDOT) is responsible for the establishment and classification of a state highway network which includes Interstate Highways, U.S. Highways, and state routes. U.S. and Interstate highways are classified as state routes in Pennsylvania.

The Commonwealth of Pennsylvania established the Location Referencing System (LRS) in 1987, which registers all numbered routes in Pennsylvania as SR-X. A state route would be SR 39, a US Route would be SR 22, and an Interstate route would be SR 80. However, routes which are numbered between 0000 and 0999 are classified as Traffic Routes, which are abbreviated as PA 39, US 22, and I-80, instead.

There are also four-digit numbers for various "state roads" over which PennDOT has jurisdiction, but those numbers are not displayed on the roads, except in rural areas, where they are posted with index-card-sized small signs. In urban areas, these numbers are somewhat less prominently posted, and these streets are known by the names on the street signs.

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