(a) The department shall erect and maintain a Texas flag to designate the state boundary at an appropriate location at or near each interstate, United States, or state highway originating at an official port-of-entry along an international border.
(b) A Texas flag flown under this section shall be visible from the international port-of-entry and must be equal in size or larger than the flag of any foreign nation flown at the port-of-entry operating on the other side of the international border.
(c) The department may contract with any governmental or private entity for the care and maintenance of any Texas flag flown under this section.