The methods of constructing, reconstructing and maintaining the public roads and bridges in this state, other than those under the actual charge of the State Highway Department, shall be as follows:

Any county may purchase implements and material through its central purchase system; may employ labor; may work, construct, reconstruct and maintain the public roads; may build bridges; and may do any and all things necessary to be done to work, construct, reconstruct and maintain the public roads and to build bridges as herein provided. If, in the opinion of the board of supervisors, any part of the work necessary to be done in working, constructing, reconstructing and maintaining the public roads and in building bridges in such county, or any part or parts thereof, can best be done by awarding contracts therefor, the board of supervisors may advertise for bids and make contracts therefor in accordance with the provisions of Section 31-7-13; and the board of supervisors may, in its discretion, use any funds heretofore or hereafter raised by bond issue or otherwise for working, constructing, reconstructing, maintaining and improving the public roads and for building bridges as herein provided. Except for contracts exempt from the provisions of Section 19-11-27, no contract provided above shall be awarded that shall extend beyond thirty (30) days from the termination and end of the term of office of the members of the boards of supervisors awarding same.

Before any board of supervisors may hire, lease or rent any heavy road machinery or equipment for use in the construction, reconstruction or maintenance of any county road or bridge, such board of supervisors shall first adopt an order adjudicating the necessity for leasing or renting such machinery or equipment, the purposes for which it is to be used, the type of such machinery or equipment and the reasons why the leasing or renting thereof will promote the public interest of the county. Such order shall also direct the clerk of the board of supervisors to advertise for bids for such machinery or equipment, which bids shall be returnable on a day to be fixed by the board of supervisors, in accordance with Section 31-7-13.

All contracts for the leasing or renting of such machinery or equipment shall be awarded to the lowest and best responsible bidder whose bid price or rental consideration is not in excess of the current rates and charges fixed and prescribed by the Nielsen/Data Quest publication, which rates and charges fixed and prescribed by the Nielsen/Data Quest publication shall be on file with the Governor’s Office of General Services at that time.

All invoices submitted for the leasing or renting of such machinery or equipment shall identify the equipment by number and name and shall include the number of hours of labor performed and the dates thereof.