In all cases where the Department of Transportation has heretofore, or may hereafter lawfully designate any highway or other separate roadway, under its jurisdiction for one-way traffic and shall erect appropriate signs giving notice thereof, it shall be unlawful for any person to willfully drive or operate any vehicle on said highway or roadway except in the direction so indicated by said signs.
N.C. Gen. Stat. § 20-165.1