(a) Interstate Highway 27 between its intersection with United States Highway 84 in Lubbock and its intersection with Interstate Highway 40 in Amarillo is designated as the Marshall Formby Memorial Highway.
(b) The department shall design and construct memorial markers indicating the highway number, the designation as the Marshall Formby Memorial Highway, and any other appropriate information.

(c) The department shall erect a marker at each end of the highway and at appropriate intermediate sites along the highway.
(d) Notwithstanding Subsections (b) and (c), the department is required to design, construct, and erect the markers only to the extent that money is available for this purpose from a grant or donation of private funds.
(e) Funds collected by the department under § 225.021 for the purpose of implementing this section shall be deposited to the credit of the state highway fund.