Tex. Const. art. VIII, § 7-c
(c) Money deposited to the credit of the state highway fund under this section may be appropriated only to:
(d) The legislature by adoption of a resolution approved by a record vote of two-thirds of the members of each house of the legislature may direct the comptroller of public accounts to reduce the amount of money deposited to the credit of the state highway fund under Subsection (a) or (b) of this section. The comptroller may be directed to make that reduction only:
(e) Subject to Subsection (f) of this section, the duty of the comptroller of public accounts to make a deposit under this section expires:
(Added Nov. 3, 2015.)