Interstate 78

Interstate 78
I-78 highlighted in red
Route information
Maintained by PennDOT, DRJTBC, NJDOT, NJTA, and PANYNJ
Length	146.28 mi[1] (235.41 km)
Existed	1957–present
NHS	Entire route
Restrictions	No hazardous goods in Holland Tunnel
Major junctions
West end	I-81 in Union Township, PA
Major intersections	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 at the Union Township–Hillside, NJ line US 1-9 / Route 21 in Newark, NJ I-95 Toll / N.J. Turnpike / US 1-9 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 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.^[2] 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.