Editing Pennsylvania Turnpike (section)

===Western Extension===
[[File:Pennsylvania Turnpike westbound.jpg|thumb|right|alt=Cars and trucks on four-lane, divided highway|Westbound approaching the Pittsburgh interchange with I-376/US&nbsp;22 in Monroeville]]

The turnpike begins at the Ohio state line in Lawrence County, where it continues west as the [[Ohio Turnpike]]. From the state line, the highway heads southeast as a four-lane freeway ([[Interstate 76 (Ohio–New Jersey)|I-76]]) through rural areas south of [[New Castle, Pennsylvania|New Castle]]. A short distance from the Ohio line, the eastbound lanes pass the electronic Gateway toll gantry. The highway then reaches [[Beaver County, Pennsylvania|Beaver County]] and the first interchange with I-376 (the Beaver Valley Expressway) in [[Big Beaver, Pennsylvania|Big Beaver]].<ref name=patpmap>{{cite map |author = Pennsylvania Turnpike Commission |publisher = Pennsylvania Turnpike Commission |title = The Pennsylvania Turnpike Simplified Map |url = https://www.paturnpike.com/pdfs/travel/Mainline_Simple_Map_Printable.pdf |access-date = August 3, 2015 |archive-date = October 17, 2015 |archive-url = https://web.archive.org/web/20151017204351/https://www.paturnpike.com/pdfs/travel/Mainline_Simple_Map_Printable.pdf |url-status = dead }}</ref><ref name=gm>{{cite map |author = ((Google)) |author-link = Google |date = September 6, 2012 |map-url = https://maps.google.com/maps?saddr=I-76+E&daddr=I-276+E&hl=en&sll=40.117338,-74.831539&sspn=0.002203,0.005284&geocode=FW5CcAId9l0z-w%3BFRIjZAIdAi2K-w&t=h&mra=ls&z=7 |map = Overview of Pennsylvania Turnpike |title = [[Google Maps]] |publisher = Google |access-date = September 6, 2012 }}</ref><ref name=adc>{{cite book |author = [[ADC Map]] |title = Pennsylvania State Road Atlas |year = 2003 |location = Alexandria, Virginia |publisher = ADC Map |pages = 54–56, 68–78, 82–84 |isbn = 0875303714 }}</ref>

It then passes under [[Norfolk Southern Railway|Norfolk Southern]]'s Koppel Secondary rail line before the exit for [[Pennsylvania Route 18|PA&nbsp;18]] near [[Homewood, Pennsylvania|Homewood]], crossing [[CSX Transportation|CSX]]'s [[Pittsburgh Subdivision]] rail line, the [[Beaver River (Pennsylvania)|Beaver River]], and Norfolk Southern's Youngstown Line on the [[Beaver River Bridge]].<ref name=ptc1981>{{cite book |title = The Pennsylvania Turnpike |publisher = Pennsylvania Turnpike Commission |year = 1981 }}</ref><ref name=patpmap/><ref name=gm/> The road enters [[Butler County, Pennsylvania|Butler County]] and [[Cranberry Township, Butler County, Pennsylvania|Cranberry Township]],<ref name=adc/> where an interchange accesses [[Interstate 79|I-79]] and [[U.S. Route 19 in Pennsylvania|US&nbsp;19]]. It continues through rural land and suburban development north of Pittsburgh into [[Allegheny County, Pennsylvania|Allegheny County]].<ref name=gm/><ref name=adc/>

The turnpike approaches the [[Warrendale, Pennsylvania|Warrendale]] toll gantry (where the closed toll system begins) and continues southeast, passing over the CSX [[P&W Subdivision]] rail line operated by the [[Buffalo and Pittsburgh Railroad]] to an interchange with [[Pennsylvania Route 8|PA&nbsp;8]] in [[Hampton Township, Allegheny County, Pennsylvania|Hampton Township]]. The Allegheny Valley exit in [[Harmar Township, Allegheny County, Pennsylvania|Harmar Township]] accesses [[Pennsylvania Route 28|PA&nbsp;28]] via Freeport Road.<ref name=patpmap/><ref name=gm/> The road then heads south, with [[Canadian National Railway|Canadian National]]'s [[Bessemer and Lake Erie Railroad|Bessemer Subdivision]] rail line parallel on the east, before crossing Norfolk Southern's [[Conemaugh Line]], the [[Allegheny River]], and the [[Allegheny Valley Railroad]]'s Allegheny Subdivision line on the six-lane [[Allegheny River Turnpike Bridge]].<ref name=patpmap/><ref name=gm/><ref name=ppg102409/>

It returns to four lanes after the river crossing, passing through the [[Oakmont Country Club]] before a bridge over Canadian National's Bessemer Subdivision; rail tracks parallel the west side of the road before splitting further west. The highway heads southeast to [[Monroeville, Pennsylvania|Monroeville]], an eastern suburb of Pittsburgh; an interchange with the eastern terminus of I-376 and [[U.S. Route 22 in Pennsylvania|US&nbsp;22]] (the Penn–Lincoln Parkway) accesses Pittsburgh.<ref name=patpmap/><ref name=gm/> It traverses eastern Allegheny County before entering [[Westmoreland County, Pennsylvania|Westmoreland County]].<ref name=gm/><ref name=adc/> The turnpike then heads south and passes over Norfolk Southern's [[Pittsburgh Line]] before the exit for [[U.S. Route 30 in Pennsylvania|US&nbsp;30]] near [[Irwin, Pennsylvania|Irwin]].<ref name=patpmap/><ref name=gm/>