Tex. Gov't Code § 2262.002
(b) This chapter does not apply to contracts of the Texas Department of Transportation that:
Added by Acts 2001, 77th Leg., ch. 1422, Sec. 5.01, eff. Sept. 1, 2001.
Acts 2005, 79th Leg., Ch. 281 (H.B. 2702), Sec. 2.93, eff. June 14, 2005.