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.
39-13-08. No traffic-control device to be manufactured or sold which does not conform. No person, firm, corporation, or limited liability company may sell or offer for sale to street and highway authorities, and no such authorities may purchase or manufacture any traffic-control device which does not conform to the manual unless specifically approved by the director.