(a) Notwithstanding § 225.001(c), the portion of Interstate Highway 30 in Rockwall County is designated as the Congressman Ralph Hall Highway. The designation is in addition to any other designation.
(b) Subject to § 225.021(c), the department shall:
(1) design and construct markers indicating the designation as the Congressman Ralph Hall 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.