[With regard to any county which is required to operate on a countywide system of road administration as described in Section 19-2-3, this section shall read as follows:]

Monies collected by the State Tax Commission or remitted to said commission by tax collectors or other officers, as proceeds from the tax imposed by this article and subject to tax collector’s commissions and fees, shall be apportioned by the commissioner who shall determine such amounts as due each county and shall certify to the State Treasurer the amount due each county at the end of each month.

The State Treasurer shall requisition monies from such accounts in such amounts as determined and certified by the Chairman of the State Tax Commission. The State Fiscal Management Board shall deliver the warrant to the State Treasurer who shall transfer such funds to each county by warrant or by electronic funds transfer on or before the fifteenth of the month following collection by the commission to the depositories of the counties of the state, upon signed receipt from the chancery clerk of each county, as follows:

One-third (⅓) of said amount shall be paid to the counties in the proportion which the monthly computed number of registered motor vehicles situated therein bears to the whole monthly computed number of such vehicles registered in the state; one-third (⅓) of said amount shall be paid to the counties in the proportion which the number of square miles of each county bears to the total square miles in the state; and one-third (⅓) of said amount shall be paid to the counties in the proportion which the population of each county bears to the total population of the state, as shown by the last preceding federal census. Said sums shall constitute a road fund of such county receiving its proportionate share and shall thereafter be used as follows:

In any county having road or bridge bonds outstanding which exceed in the aggregate twelve percent (12%) of the assessed valuation of the taxable property of the county, it shall be the duty of the board of supervisors to set aside not less than sixty percent (60%) of such county’s share of the tax paid to such county under the provisions of this article, to be used in paying the principal and interest of such road or bridge bonds as they mature.

In any county having road or bridge bonds outstanding which exceed in the aggregate five percent (5%) of the assessed valuation of the taxable property of the county, but which do not exceed in the aggregate twelve percent (12%) of the assessed valuation of the taxable property of the county, it shall be the duty of the board of supervisors to set aside not less than thirty-five percent (35%) of such county’s share to be used in paying the principal and interest of such road or bridge bonds as they mature. And, in any county having road or bridge bonds outstanding which do not exceed in the aggregate five percent (5%) of the assessed valuation of the taxable property of the county, it shall be the duty of the board of supervisors to set aside not less than ten percent (10%) of such county’s share of the proceeds of the tax paid to such county under the provisions of this article to be used in paying the principal and interest on such road or bridge bonds as they mature.

The portion of such county’s share of the privilege taxes imposed by this article thus set aside for the payment of the principal and interest of road or bridge bonds, as provided for in this section, shall be used in paying the currently maturing installments of principal and interest of road and bridge bonds, if there be any such road or bridge bonds outstanding.

The remaining portion of such county’s share of the privilege taxes, after setting aside the portion above provided for the payment of principal and interest of bonds, shall be used in the construction and maintenance of any public highways, bridges or culverts of the county, in the discretion of the board of supervisors; or in paying the interest and principal of county road and bridge bonds, in the discretion of the board of supervisors.

In any county having no road or bridge bonds outstanding, all of such county’s share of the privilege taxes paid to such county under the provisions of this article shall be used in the construction, reconstruction and maintenance of the public highways, bridges or culverts of the county, as the board of supervisors may determine.