Route Description
Route 478 begins at an intersection with Pennsylvania Route 38 and its concurrency with Pennsylvania Route 208 northeast of Emlenton. The highway progressed to the southeast, crossing into Clarion County. There, Route 478 enters a partial interchange with Interstate 80, intersecting with the westbound ramps for Exit 45. After Interstate 80, Route 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, Route 478 becomes Salem Avenue, progressing southeast through residential homes and terminating at an intersection with Pennsylvania Route 58 (Main Street).
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“A route differs from a road not only because it is solely intended for vehicles, but also because it is merely a line that connects one point with another. A route has no meaning in itself; its meaning derives entirely from the two points that it connects. A road is a tribute to space. Every stretch of road has meaning in itself and invites us to stop. A route is the triumphant devaluation of space, which thanks to it has been reduced to a mere obstacle to human movement and a waste of time.”
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—Ralph Waldo Emerson (1803–1882)