U.S. Route 122, is runs from Warren County Route 678 & Pursel Street in Phillipsburg toward an intersection by U.S. Route 22 in Pohatcong Township. The route is a past alignment of U.S. Route 22, designated in 1926. The route became U.S. Route 22 Alternate awaiting 1993, when the route was decommissioned & replaced in County Route 678 & Route 122.