(a) General. – When special revenue bonds have been issued as provided in this article and the amount of county transportation sales and use taxes collected, less costs of administration, collection and enforcement, exceeds the amount needed to pay project costs and annual debt service, including the funding of required debt service and maintenance reserves, if any, the additional amount remaining in the county's subaccount in the County Road Improvement Account shall be used to retire outstanding revenue bonds before their maturity date in accordance with the terms of such bonds.

(b) Termination of county transportation sales and use taxes. – Once the special revenue bonds issued as provided in this article are no longer outstanding or have been defeased, and no additional road construction projects have been requested and approved by the Commissioner of Highways, the county transportation sales and use taxes shall be discontinued by order adopted by the county commission as provided in this article. Termination of the county transportation sales and use taxes as provided in this section may not bar or otherwise prevent the Tax Commissioner from collecting county transportation sales and use taxes that accrued before the termination date and the rights of the state and the taxpayers as to those taxes shall be preserved.

(c) Excess funds. – After all intergovernmental agreements with the Commissioner of Highways have ended and all debt service on special revenue bonds issued to finance, in whole or in part, the road construction projects has been paid or provided for, and county transportation sales and use taxes imposed by the county have terminated, the Commissioner of Highways shall forward the unencumbered balance of moneys remaining in the county's subaccount in the County Road Improvement Account to the county commission of that county for deposit in the county's general fund.