Texas Transportation Code - TRANSP § 228.113. Trust Fund

(a) All money received under this subchapter, whether as proceeds from the sale of bonds or as revenue, is a trust fund to be held and applied as provided by this subchapter.  Notwithstanding any other law, including Section 9, Chapter 1123, Acts of the 75th Legislature, Regular Session, 1997, and without the prior approval of the comptroller, funds held under this subchapter shall be held in trust by a banking institution chosen by the department or, at the discretion of the department, in trust in the state treasury outside the general revenue fund.

(b) The order authorizing the issuance of bonds or the trust agreement securing the bonds shall provide that an officer to whom or a bank or trust company to which the money is paid shall act as trustee of the money and shall hold and apply the money for the purpose of the order or trust agreement, subject to this subchapter and the order or trust agreement.