(a) The portion of State Highway 31 under construction as of September 1, 2017, as a relief route around Corsicana, in Navarro County is designated as the Navarro County Vietnam Memorial Loop.
(b) Subject to Section 225.021(c), the department shall:
(1) design and construct markers indicating the designation as the Navarro County Vietnam Memorial Loop and any other appropriate information; and
(2) erect a marker at each end of the highway and at appropriate intermediate sites along the highway.