(a) The portion of Ranch-to-Market Road 150 in Hays County between its intersection with Ranch-to-Market Road 12 and its intersection with Ranch-to-Market Road 3237 is designated as the William B. Travis Heritage Trail.
(b) Subject to Section 225.021(c), the department shall:
(1) design and construct markers indicating the designation as the William B. Travis Heritage Trail and any other appropriate information; and
(2) erect a marker at each end of the highway and at appropriate intermediate sites along the highway.