(a) To implement this subtitle, the Texas Department of Transportation may place and maintain a traffic-control device on a state highway as provided by the manual and specifications adopted under § 544.001. The Texas Department of Transportation may provide for the placement and maintenance of the device under § 221.002.
(b) To implement this subtitle or a local traffic ordinance, a local authority may place and maintain a traffic-control device on a highway under the authority’s jurisdiction. The traffic-control device must conform to the manual and specifications adopted under § 544.001.

(c) A local authority may not place or maintain a traffic-control device on a highway under the jurisdiction of the Texas Department of Transportation without that department’s permission, except as authorized under § 545.3561.