Pennsylvania Route 420
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| Route information | ||||
| Maintained by PennDOT | ||||
| Length: | 5.600 mi (9.012 km) | |||
| Major junctions | ||||
| South end: |
 PA 291 in Tinicum Township
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 I-95 in Tinicum Township US 13 in Prospect Park
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| North end: |
 PA 320 in Springfield Township
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| Location | ||||
| Counties: | Delaware | |||
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| Location: | Prospect Park, Pennsylvania |
| Length: | 2.8 mi (4.5 km) |
| Existed: | 2013–present |
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| Location: | Ridley Township, Pennsylvania |
| Length: | 2.7 mi (4.3 km) |
| Existed: | 2013–present |
Pennsylvania Route 420 (PA 420) is a north–south state highway in Delaware County, Pennsylvania. The route runs 5.6 miles (9.0 km) from PA 291 in Tinicum Township, a short distance west of the Philadelphia International Airport, northwest to PA 320 in Springfield Township. PA 420 runs through suburban areas, passing through Prospect Park, Folsom, and Morton. The route interchanges with Interstate 95 (I-95) in Tinicum Township and intersects U.S. Route 13 (US 13) in Prospect Park. PA 420 was first designated by 1928 to run from PA 191 at the intersection of 84th Street and Bartram Avenue in Philadelphia to PA 320 in Springfield. By 1950, the southern terminus was moved to its current location at PA 291.
PA 420 begins at an intersection with PA 291 in Tinicum Township, Delaware County, heading north on four-lane divided Wanamaker Avenue. South of here, Wanamaker Avenue continues south as an unnumbered road into the community of Essington toward the Delaware River. From PA 291, the route passes near businesses and comes to a cloverleaf interchange with I-95, where it curves to the north-northwest. Past this interchange, the road heads through wooded areas within the John Heinz National Wildlife Refuge at Tinicum before crossing the Darby Creek into the borough of Prospect Park. Here, PA 420 curves north and becomes four-lane undivided Lincoln Avenue, heading into residential areas. The route turns north-northwest again and intersects US 13 near businesses. The road narrows to two lanes and passes more homes and businesses, running through the downtown of Prospect Park. PA 420 comes to a bridge under Amtrak's Northeast Corridor near the Prospect Park station serving SEPTA's Wilmington/Newark Line before it runs past more homes. The route crosses under CSX's Philadelphia Subdivision, at which point it enters Ridley Township and becomes Kedron Avenue.
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