In the 1953 New Jersey state highway renumbering, the state highways running concurrent with US 206 were removed. When US 206's current alignment bypassing Columbus was built by the 1960s, the designation of Route 170 was given to the old alignment through Columbus; this road was turned over to Burlington County in the 1980s and is now CR 690. In the late 1960s, a freeway was proposed for the US 206/Route 54 corridor, running from US 30 in Hammonton south to Route 55 and the proposed Route 60 near Vineland and Millville. Originally, a parkway had been planned in 1932 to serve the US 206 corridor between Hammonton and Trenton, but never materialized. The freeway between Vineland/Millville and Hammonton was to cost $47 million and was intended to provide a better route between the two areas than the existing two-lane roads. However, it was never built due to environmental and financial issues.