Interstate 78 (I-78) is a highway running for 144 miles in the northeast United States from Harrisburg, Pennsylvania to New York City. The stretch in the state of New Jersey runs for 67.83 miles from Phillipsburg to Jersey City. The highway crosses the counties of Warren, Hunterdon, Somerset, Union, Essex, and Hudson. It is also known as the Phillipsburg–Newark Expressway.
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