MARTIN LUTHER KING, JR., FREEWAY. (a) The part of United States Highway 287 south of State Highway 180 to its intersection with Interstate Highway 820 in Tarrant County is designated as the Dr. Martin Luther King, Jr., Freeway.
(b) The department shall design and construct memorial markers indicating the highway number, the designation as the Dr. Martin Luther King, Jr., Freeway, 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) The department is not required to design, construct, or erect a marker under this section unless the department receives a grant or donation to cover the cost of the design, construction, and erection.