(a) Beltway 8 in Harris County is the Sam Houston Parkway.
(b) The department shall construct markers indicating the designation as the Sam Houston Parkway and other appropriate information.

(c) The department may design the markers in coordination with a local entity. The department has final authority to approve the design of the markers.
(d) The department shall erect a marker every five miles along the beltway except at sites where the department determines the placement of a marker is not feasible.