Whenever after the final adoption of a plan for a limited access highway by the department, an additional design public hearing with respect to the facility or any portion thereof is conducted pursuant to federal law resulting in a revision of the design of the limited access plan, the department may modify the previously adopted limited access plan to conform to the revised design without further public hearings providing the following conditions are met:
(1) As compared with the previously adopted limited access plan, the revised plan will not require additional or different right-of-way with respect to that section of highway for which the design has been revised, in excess of five percent by area; and
(2) If the previously adopted limited access plan was modified by a board of review convened at the request of a county, city, or town, the legislative authority of the county, city, or town shall approve any revisions of the plan which conflict with modifications ordered by the board of review.