(a) The interchange in Irving between State Highway 183, State Highway 114, Loop 12/Interstate Highway 35E, Spur 482 and Trinity Parkway, and the Orange Line of the Dallas Area Rapid Transit Authority is designated as the Irving Diamond Interchange.
(b) The department shall design and construct markers indicating the interchange number, the designation as the Irving Diamond Interchange, and any other appropriate information.

(c) The department shall erect a marker at one or more sites on the interchange and approaching the interchange in each direction.