(a) The portion of U.S. Highway 385 South between the southern municipal limit of Seagraves and Gaines County Park is designated as the Irvin "Butch" Hill Memorial Highway.
(b) Subject to Section 225.021(c), the department shall:
(1) design and construct markers indicating the designation as the Irvin "Butch" Hill Memorial Highway and any other appropriate information; and
(2) erect a marker at each end of the highway and at appropriate intermediate sites along the highway.