(2) The board of county commissioners in its annual budget has the option of providing for the application of all or part of the proceeds of the county motor license fund to all or part of the payments of principal and interest on bridge bonds maturing in the ensuing year. In case this option is exercised and such other provision is made for meeting the debt requirement, in whole or in part, then the tax levy authorized by subsection (1) of this section shall only be for such amount, if any, as may be necessary over and above this other provision of funds.