Interstate 78 in Pennsylvania

Interstate 78
Route information
Maintained by PennDOT & DRJTBC
Length:	75.23 mi (121.07 km)
Major junctions
West end:	I-81 In Union Township
	US 22 in Union Township PA 183 near Strausstown PA 61 near Hamburg PA 100 in Fogelsville US 22 in Upper Macungie Township PA 309 from Dorneyville to Summit Lawn US 222 / PA 222 near Dorneyville PA 29 near Allentown PA 33 in Lower Saucon Township
East end:	I-78 at New Jersey state line in Williams Township
Location
Counties:	Lebanon, Berks, Lehigh, Northampton
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Pennsylvania State Route System Interstate US State Scenic Byways Legislative ← PA 77 PA 78 → ← PA 177 I-178 PA 178 →

Interstate 178
Location:	Allentown, Pennsylvania
Existed:	1950s–1971

Interstate 378
Location:	Bethlehem, Pennsylvania
Existed:	1968–1971

Interstate 78 (I-78) is an east–west route stretching from Union Township in Lebanon County, Pennsylvania to New York City. In the U.S. state of Pennsylvania, I-78 runs for about 77 miles (124 km), from the western terminus at Interstate 81 to the New Jersey state line.

I-78 starts in Pennsylvania at an interchange with Interstate 81. It merges with U.S. Route 22 in Lebanon County, with the median strip becoming narrow at that point; the two run together for 43 miles (69 km) from Bethel Township to Kuhnsville. Near Kuhnsville, U.S. Route 22 splits off from I-78 and becomes the Lehigh Valley Thruway. Near Hamburg at mile marker 29, it meets a major Pennsylvania route: Pennsylvania Route 61. At mile marker 53, after the departure of US 22, Pennsylvania Route 309 merges with I-78 for 7 miles (11 km). Dorney Park & Wildwater Kingdom is visible from the freeway approaching exit 54 for U.S. Route 222, which leads to the park. In Summit Lawn, State Route 309 leaves the freeway toward Quakertown at exit 60. Past Allentown and Bethlehem, Pennsylvania Route 33 meets I-78 at exit 71. The last exit in Pennsylvania is Exit 75/Morgan Hill Road, which connects to Pennsylvania Route 611. The Interstate crosses the Delaware River on the Interstate 78 Toll Bridge, leaving Pennsylvania for New Jersey. Tolls are only required on the westbound side, coming into Pennsylvania.

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Wikipedia