The three (3) citizens of the State of Mississippi who are members of the U.S. Highway 82 Four Lane Construction Authority shall be appointed by the Governor as follows: Each appointee shall be a resident of a county in this state which is traversed by U.S. Highway 82; one (1) shall be appointed from a county bordering the State of Arkansas, one (1) from a county bordering the State of Alabama, and one (1) from a county in the central portion of the state. Such members shall serve for terms of four (4) years each. Vacancies shall be filled by the Governor for the unexpired terms.