Interstate 78

Interstate 78 is an Interstate Highway in the Northeast United States, running 144 miles from Interstate 81 northeast of Harrisburg, Pennsylvania, through Allentown, Pennsylvania, and western and northern New Jersey to the Holland Tunnel and Lower Manhattan in New York City.I-78 is a major road linking ports in the New York City and New Jersey area to points west, and sees over 4 million trucks annually, with trucks representing 24% of all traffic. Truck traffic on the road is projected to rise following the widening of the Panama Canal in 2016, as more Asian ships are now expected to use East Coast ports.Route descriptionPennsylvaniaI-78 begins at a directional-T interchange with I-81 in Union Township, Lebanon County, Pennsylvania, about 25mi northeast of Harrisburg. Near the east end of the county, at exit 8, U.S. Route 22 (US 22) merges with I-78, running concurrently for the next 43mi.