History
Route 51 was first signed in 1927. The north section was signed first, followed by the section between Pittsburgh and Uniontown. Major construction projects included a bypass of Perryopolis built in 1950, the West End Bypass in Pittsburgh that was completed in 1953, and the interchange at the southern portal of the Liberty Tunnels in Pittsburgh.
Before the turnpikes were built, Route 51, alongside Ohio State Route 14, served as the main corridor connecting Pittsburgh and Cleveland.
The Saw Mill Run Boulevard section of the highway was the first direct connection between Pittsburgh and the South Hills once the Liberty Tunnel was completed. It significantly decreased the driving time to Pittsburgh from the cities of Clairton, Duquesne, McKeesport.
Improvements are planned at the intersection with PA 88 south of Pittsburgh, where bottlenecks occur regularly. Other improvements planned include new interchanges at the Liberty Tunnel and West End Bridge (West End Circle), a center median for the rest of Saw Mill Run Boulevard, and an improved intersection with Woodruff Street.
Read more about this topic: Pennsylvania Route 51
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—Walter Bagehot (1826–1877)
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—Henry David Thoreau (1817–1862)