Tex. Parks & Wild. Code § 13.0145
(a) The department shall set and enforce speed limits on a road in a state park, wildlife management area, or other site under the control of the department as follows:
(b) The department shall:
Added by Acts 2007, 80th Leg., R.S., Ch. 1159 (H.B. 12), Sec. 24, eff. June 15, 2007.