Interstate 376
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| Route information | ||||
| Auxiliary route of I-76 | ||||
| Maintained by PennDOT and Pennsylvania Turnpike Commission | ||||
| Length: | 84.70 mi (136.31 km) | |||
| Existed: | 1972, extended 2009 – present | |||
| Major junctions | ||||
| West end: |
  I-80 / PA 760 near Hermitage
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| East end: |
   I-76 / Penna Turnpike / US 22 in Monroeville
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| Location | ||||
| Counties: | Mercer, Lawrence, Beaver, Allegheny | |||
| Highway system | ||||
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| Location: | Allegheny County |
| Existed: | 2009–present |
Interstate 376 (I-376) is a major auxiliary route of the Interstate Highway System in the U.S. state of Pennsylvania, located within the Allegheny Plateau. It runs from I-80 near Sharon south and east to a junction with the Pennsylvania Turnpike (I-76, its parent) in Monroeville, after having crossed the Turnpike at an interchange earlier in its route. The route serves Pittsburgh, Pennsylvania and its surrounding areas, and is the main access road to Pittsburgh International Airport (PIT). Within Allegheny County, the route runs along the majority of the Penn-Lincoln Parkway, known locally as the Parkway West and the Parkway East. The route is also known by several other names in various jurisdictions. It is currently the fifth-longest auxiliary Interstate route in the system, and second only to I-476 within Pennsylvania.
I-376 is signed east–west despite running north–south for nearly three-quarters of its length; however, it does run east–west through the majority of Allegheny County. This is because when the route was first conceived, it was an east–west highway that only connected I-279 in Downtown Pittsburgh to the Turnpike in Monroeville. Despite the route's direction, it serves as a major artery through Pittsburgh's West End, with I-79 being the primary route through Pittsburgh's North Hills. Since its 2009 extension, the route has also served as a major way to access Northeast Ohio.
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