Tex. Transp. Code § 472.014
Notwithstanding any other provision of law, the department and its officers and employees are not liable for:
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.
Amended by Acts 1997, 75th Leg., ch. 1171, Sec. 1.43(b), eff. Sept. 1, 1997.