(a) The portion of State Loop 111 in Travis County between its northern intersection with Levander Loop and its intersection with Farm-to-Market Road 969 is designated as the Richard Overton Memorial Highway. The designation is in addition to any other designation.
(b) Subject to Section 225.021(c), the department shall:
(1) design and construct markers indicating the designation as the Richard Overton Memorial Highway and any other appropriate information; and
(2) erect a marker at appropriate sites along the loop.