 US 22 in eastern Pennsylvania is a four lane limited-access expressway between Easton and Interstate 78 to the west; it is dually designated with the Lehigh Valley Thruway in Allentown.The original designation for this expressway was to be Interstate 78, but local opposition to a freeway in Phillipsburg, along with substandard conditions at Easton, forced federal highway officials to relocate Interstate 78 south of Allentown, Bethlehem, Easton, and Phillipsburg.U.S.