The representatives from the State of Arkansas who shall be members of the U.S. Highway 82 Four Lane Construction Authority shall be the five (5) members of the State Highway Commission who are each duly serving in the capacity as such a commissioner. During the course and extent of the compact, any newly appointed commissioner, or one appointed to fill the unexpired term of a commissioner, shall be a member of the authority and the replaced commissioner shall cease to be a member of the authority.