Orders on the improvement fund of any special assessment district created and existing hereunder, shall be drawn by the state highway commissioner or by the chairman of the board of county road commissioners on the majority vote of the members of said board, as the case may be, and countersigned by the county clerk. In no event shall any order or orders be drawn in excess of the amount raised or directed to be raised on account of any particular improvement. Such order shall be payable by any county treasurer having in custody any portion of the funds of such special assessment district or out of such funds. In any case where the special assessment district is situated in 2 or more counties, no orders shall be drawn upon the treasurer of either of said counties payable out of the funds of said district in excess of the amounts that will come into his custody as a part of said fund under the provisions hereof.