1. The commissioners of the district may sell any of said bonds, at public or at private sale, for not less than ninety-five percent of their face value.

2. Such bonds shall be payable and collectible only out of moneys derived from such special tax bills and from the sale of such bonds, and interest that may accrue on funds so derived while on deposit with any county depositary, and the county treasurer shall hold in reserve, for payment of interest on such bonds, a sufficient amount of the money so derived that may come into his hands in excess of the amount then necessary to pay all bonds and interest then past due, to pay all interest that will become payable before the next installment of such special tax becomes payable, and three percent of the principal amount of the bonds not then due, and the county treasurer shall, whenever any of said bonds or interest thereon become due, apply such money as may be in his custody and applicable thereto, or that may thereafter come into his custody and be applicable thereto, to payment of such bonds and interest as may be due and unpaid.

3. All money derived from such special tax bills shall be used in paying said bonds and the interest thereon, except that money that may be collected on such tax bills in excess of the amount necessary to pay all bonds then past due and such bonds and interest as will become payable before another installment of such special tax becomes payable, may, less an amount equal to three percent of the principal amount of the bonds not then due be used for other purposes as herein authorized.

4. The county treasurer shall, as such bonds are sold, deliver them to the purchaser thereof upon being ordered to do so by the commissioners, and being paid the price therefor, and as such bonds are paid shall cancel them and deliver them to the clerk of the county commission.

5. All money derived from the sale of said bonds, except such portion thereof as is required to be reserved to meet interest payments, and all money collected on such special tax bills that may, as by this section authorized, be used for purposes other than the payment of such bonds and interest thereon, and all interest that may accrue on moneys so derived while deposited with any county depositary and not required to be used in paying said bonds or interest thereon, shall be used, and warrants drawn on the treasurer therefor, for the following purposes only: To pay the cost and expenses incurred by the special road district commissioners, as found by the county commission, in the preparation of said plans, specifications, estimate, map and profile, and said list of lands, and a reasonable attorney’s fee, as found by the county commission, for such petitioners, and to pay the cost of improving said public road or part of a public road in accordance with the plans and specifications so filed with the clerk of the county commission, and such working, administrative and incidental expenses, not otherwise provided by law, as may be incurred in making such improvements, and the balance, if any, shall be used in paying expense of maintaining such improvement.