The district may use bond proceeds to:
(1) construct, acquire, or improve a road facility;
(2) pay an expense related to the road facility;
(3) pay, or establish a reasonable reserve to pay, not more than three years' interest on the district's bonds; and
(4) pay an expense related to issuance and sale of bonds as provided by the bond orders or resolutions.
Official text of the Texas Transportation Code as published by the Texas Legislative Council.