Pennsylvania Route 88: Perry Highway (1927).Pennsylvania Route 64: Horseshoe Trail, Altoona-Bellefonte-Cumberland Trail (1927).Pennsylvania Route 55: Bucktail Trail (1927).

Pennsylvania Route 46: Bradford Farmers' Valley Highway (1927).

Pennsylvania Route 44: Highway to the Stars (Potter County).

Pennsylvania Route 41: Reading - Harrisburg (after 1924).

Pennsylvania Route 33: Lykens Valley Trail (1927).

Pennsylvania Route 24: Washington-Harrisburg Route (after 1924).

Pennsylvania Route 22: Keystone Trail (1927).

Pennsylvania Route 19: Lewistown - Scranton, Anthracite Trail (after 1924).

Pennsylvania Route 18: Erie-Lincoln Highway (1927).

Pennsylvania Route 17: Benjamin Franklin Highway (1927).

Pennsylvania Route 14: York Trail (1927).

Pennsylvania Route 13: Chambersburg, Pennsylvania - Philadelphia, Pennsylvania (after 1924).

Pennsylvania Route 11: National Pike, National Old Trails Road.

Pennsylvania Route 10: Buffalo-Pittsburgh Highway (1927).

Pennsylvania Route 9: Yellowstone Trail, Chicago-Buffalo Highway.Pennsylvania Route 8: William Flinn Highway (after 1924).Pennsylvania Route 7: Roosevelt Highway.Pennsylvania Route 6: Old Monument Trail (after 1924).Pennsylvania Route 5: Lakes-to-Sea Highway.Pennsylvania Route 4: Susquehanna Trail.Pennsylvania Route 3: William Penn Highway.Signed Traffic Route numbers from 1 to 12 were first assigned in 1924 to several of the national auto trails: See also List of legislative routes in Pennsylvania. These were the primary internal numbering until the present Location Referencing System was adopted in 1987. In 1911, when the Sproul Road Bill was passed, a large number of Legislative Routes ( LR) were assigned. 2.1 Pennsylvania routes with a different State Route number.In urban areas, these numbers are somewhat less prominently posted, and these streets are known by the names on the street signs. 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. However, routes which are numbered between 00 are classified as Traffic Routes, which are abbreviated as PA 39, US 22, and I-80, instead. A state route would be SR 39, a US Route would be SR 22, and an Interstate route would be SR 80. The Commonwealth of Pennsylvania established the Location Referencing System (LRS) in 1987, which registers all numbered routes in Pennsylvania as SR-X. and Interstate highways are classified as state routes in Pennsylvania. The Pennsylvania Department of Transportation (PennDOT) is responsible for the establishment and classification of a state highway network which includes Interstate Highways, U.S.

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