A county may authorize, issue, and sell its bonds or certificates of obligation and use the proceeds to:
(1) call, redeem, and retire a district's outstanding bonds;
(2) remove the pledge of the revenue from a district's toll road project or other road, street, or highway project and the district's convenants in connection with the bonds and toll road project; and
(3) make the toll road project available for use of the public free from tolls and charges.