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Pennsylvania Route 478

PA Route 478 marker

PA Route 478
Route information
Maintained by PennDOT
Length: 2.20 mi (3.54 km)
Existed: 1961 – present
Major junctions
West end: PA 38 / PA 208 near Emlenton
  I-80 near Emlenton
East end: PA 58 in St. Petersburg
Location
Counties: Clarion, Venango
Highway system
PA 477 I‑479

PA Route 378
Location: EmlentonSt. Petersburg
Existed: 1936–1961

PA Route 478 marker

Pennsylvania Route 478 (PA 478) is a 2.20-mile-long (3.54 km) state highway located in Clarion and Venango Counties. The highway begins at an intersection with PA 38 and PA 208 northeast of Emlenton. The highway serves the eastbound interchange for Exit 45 on Interstate 80 (I-80) and terminates at PA 58 in St. Petersburg.

The alignment of PA 478 began as part of the former alignment of PA 238 until 1936, when PA 378 was designated on the alignment. In 1961, to avoid duplication with the newly numbered I-378 in Bethlehem, the route was redesignated as PA 478.

PA 478 begins at an intersection with PA 38 and its concurrency with PA 208 northeast of Emlenton. The highway progressed to the southeast, crossing into Clarion County. There, PA 478 enters a partial interchange with I-80, intersecting with the westbound ramps for Exit 45. After I-80, PA 478 turns from its southward progression to the southeast, crossing through dense forestry. The highway soon turns back to the south, paralleling Freeman Road and entering the community of St. Petersburg. In St. Petersburg, PA 478 becomes Salem Avenue, progressing southeast through residential homes and terminating at an intersection with PA 58 (Main Street).


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