Tex. Transp. Code § 251.015
The commissioners court of a county may use county road equipment, construction equipment, including trucks, and employees necessary to operate the equipment to assist another governmental entity on a project if:
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.
Amended by Acts 1999, 76th Leg., ch. 1058, Sec. 1, eff. June 18, 1999.