Tex. Transportation Code § 441.197: FEES.

(a) A district may adopt and enforce fees in addition to taxes to provide the district revenue to operate the district and secure district bonds.

(b) A district may file a suit to recover an unpaid fee under this section. The suit must be filed in a county in which the district is located.

(c) Except as provided by Section 365.040, a fee may not be imposed on or collected for travel on a road constructed, acquired, or improved by the district.

(d) A road facility may not be encumbered by a district fee.

Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.