Interstate 78
Interstate 78 (I-78) is a major east–west Interstate Highway in the Northeastern United States that runs 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. Route description |- |PA | |- |NJ | |- ||NY | |- |Total | |} Pennsylvania I-78 begins at a directional T interchange with I-81 in Union Township, about northeast of Harrisburg. Near the east end of the county, at exit 8, U.S. Route 22 (US 22) merges with I-78, and runs concurrently for the next through Berks and Lehigh counties. At exit 51, in