Tex. Transp. Code § 252.004
(a) Before assuming the duties of an ex officio road commissioner, a county commissioner must execute a bond in the amount of $3,000 payable to the county judge for the use and benefit of the county road and bridge fund. The bond must be conditioned that the member will:
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.