History
In 1911, when the Sproul Road Bill was passed, a large number of Legislative Routes (LR) were assigned. These were the primary internal numbering until the present Location Referencing System was adopted in 1987. See also list of Legislative Routes in Pennsylvania.
Signed Traffic Route numbers from 1 to 12 were first assigned in 1924 to several of the national auto trails:
- Pennsylvania Route 1: Lincoln Highway
- Pennsylvania Route 2: Lackawanna Trail
- Pennsylvania Route 3: William Penn Highway
- Pennsylvania Route 4: Susquehanna Trail
- Pennsylvania Route 5: Lakes-to-Sea Highway
- Pennsylvania Route 6: Old Monument Trail (after 1924)
- Pennsylvania Route 7: Roosevelt Highway
- Pennsylvania Route 8: William Flinn Highway (after 1924)
- Pennsylvania Route 9: Yellowstone Trail
- Pennsylvania Route 10?: Buffalo-Pittsburgh Highway (after 1924)
- Pennsylvania Route 11: National Pike
- Pennsylvania Route 12: Baltimore Pike
- Pennsylvania Route 44: Buchanan Highway (after 1924)
- Pennsylvania Route 19: Lewistown - Scranton - Narrowsburg, NY (after 1924)
- Pennsylvania Route 88: Perry Highway (after 1924)
- Pennsylvania Route 17: Benjamin Franklin Highway (after 1924)
- Pennsylvania Route 64: Williamsport - Cumberland, MD (after 1924)
Soon more numbers were assigned, including three-digit numbers for branches, like Pennsylvania Route 272 from Pennsylvania Route 72. The United States Numbered Highways were assigned in late 1926, and in 1928 State Routes concurrent with U.S. Routes were removed, while those that conflicted with U.S. Routes were assigned new numbers. The establishment of the Interstate Highway System in 1959 resulted in a small renumbering in 1961.
Read more about this topic: List Of State Routes In Pennsylvania
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