Interstate 78

Interstate 78
Interstate 78
	I-78 highlighted in red
Route information
	Maintained by PennDOT, DRJTBC, NJDOT, NJTA, and PANYNJ
Length	146.28 mi (235.41 km)
Existed	1957–present
NHS	Entire route
Major junctions
West end	I-81 in Union Township, PA
	US 22 in Fredericksburg, PA; US 222 / PA 309 near Allentown, PA; PA 33 near Easton, PA; US 22 near Alpha, NJ; Route 31 in Clinton Township, NJ; I-287 in Bedminster, NJ; Route 24 in Springfield, NJ; G.S. Parkway in Union–Hillside, NJ; US 1-9 / US 22 / Route 21 in Newark, NJ; I-95 / N.J. Turnpike in Newark, NJ;
East end	Canal Street in New York, NY
Location
Country	United States
States	Pennsylvania, New Jersey, New York
Highway system
	Interstate Highway System; Main; Auxiliary; Suffixed; Business; Future;

Interstate 78 (I-78) is an east–west Interstate Highway in the Northeastern United States that runs 144 miles (232 km) from I-81 northeast of Harrisburg, Pennsylvania through Allentown to western and North Jersey, terminating at the Holland Tunnel entrance to Lower Manhattan in New York City. Major metropolitan areas along I-78 route include the Lehigh Valley in Pennsylvania, the Gateway Region in New Jersey, and the New York metropolitan area.

I-78 links ports in New York City and North Jersey to points west, including the Lehigh Valley, the third-largest metropolitan region of Pennsylvania. I-78 accommodates over four million trucks annually, representing 24 percent of all truck traffic in the nation. It also is a major connection point to the New York metropolitan area's three major international airports, Newark Liberty International Airport, John F. Kennedy International Airport, and LaGuardia Airport.

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