In the event the director of the industrial development division, or the director’s authorized representative, travels within or without the state for the purpose of promoting industrial development, the director shall certify the director’s expense voucher, or the voucher of the director’s authorized representative, as all other expense vouchers are certified for payment, but the same shall receive immediate and preferred attention by the commissioner of finance and administration, in view of the expected travel expense of the director or the director’s representative.