N.D. Cent. Code § 39-13-07: Uniform traffic-control devices on all streets and highways

No traffic-control devices, including markings, signs, and signals, may be used on any street or highway which do not conform to the standards of design and location as prescribed in the manual and specifications for a uniform system of traffic-control devices. The director and local authorities, on streets and highways under their respective jurisdiction, shall place such devices as are deemed necessary to regulate, warn, and guide traffic.