Tex. Transportation Code § 284.046

(a) In addition to all other rights by mandamus or other court proceeding, a holder or trustee of a bond issued under this chapter may enforce the holder's rights against the county, the county's employees, an operating board, or an agent or employee of the operating board and is entitled to:

(1) require the county and the board to impose and collect tolls and charges sufficient to carry out any agreement contained in the bond instrument; and

(2) apply for and obtain the appointment of a receiver for the project.

(b) A bond instrument may contain provisions for the protection and enforcement of a bondholder's rights and remedies, including covenants:

(1) establishing the county's duties relating to:

(A) the acquisition of property;

(B) the construction, maintenance, operation, and repair of, and insurance for, a project; and

(C) custody, safeguarding, and application of money;

(2) prescribing events that constitute default;

(3) prescribing terms on which any or all of the bonds become or may be declared due before maturity; and

(4) relating to the rights, powers, liabilities, or duties that arise on the breach of a county's duty.

(c) A bond instrument may contain provisions restricting the individual rights of action of the bondholder.