The secretary and division administrators of the department of transportation, through their authorized employees, may execute or affix their signature, by facsimile signature with a stamp, reproduction print or other similar process to all licenses, notices, orders, administrative letters, contracts, permits, offers to purchase, appraisals, certifications of records, service of legal papers or process on the administrators, and other legal instruments under the statutes which the secretary and division administrators are authorized or required to administer.