A. The state transportation commission shall place and maintain such traffic-control devices, conforming to its manual and specifications, upon all state highways as it deems necessary to indicate and to carry out the provisions of Chapter 66, Article 7 NMSA 1978 or to regulate, warn or guide traffic.
B. No local authority shall place or maintain any traffic-control device upon any highway under the jurisdiction of the state transportation commission except by permission of the commission.