(a) The portion of United States Highway 259 Relief Route from 4/10 mile south of the northern Kilgore municipal boundary to 7/10 mile south of the southern Kilgore municipal boundary is designated as the Charles K. Devall Memorial Highway.
(b) The department shall design and construct memorial markers indicating the highway number, the designation as the Charles K. Devall Memorial Highway, and any other appropriate information.
(c) The department shall erect a marker at each end of the highway and at appropriate intermediate sites along the highway.
(d) In this section, a reference to the Kilgore municipal boundary means that boundary as it exists on January 1, 2001.