Tex. Transp. Code § 451.111
(a) Except as provided by Subchapter Q, unless the posting requirement in Subsection (b) is satisfied, a board may not let a contract that is:
(2) for:
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.
Amended by Acts 1999, 76th Leg., ch. 1479, Sec. 2, eff. June 19, 1999.
Acts 2005, 79th Leg., Ch. 1277 (H.B. 2300), Sec. 3, eff. September 1, 2005.
Acts 2011, 82nd Leg., R.S., Ch. 801 (H.B. 2325), Sec. 2, eff. September 1, 2011.