Tex. Transp. Code § 222.001
(a) Money that is required to be used for public roadways by the Texas Constitution or federal law and that is deposited in the state treasury to the credit of the state highway fund, including money deposited to the credit of the state highway fund under Title 23, United States Code, may be used only:
(b) Notwithstanding Section 222.103, the department may not pledge or otherwise encumber money deposited in the state highway fund to:
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.
Acts 2009, 81st Leg., R.S., Ch. 771 (S.B. 883), Sec. 1, eff. June 19, 2009.
Acts 2015, 84th Leg., R.S., Ch. 314 (H.B. 20), Sec. 5, eff. June 3, 2015.