The following positions and administrations set forth in this chapter shall be exempt from Chapter 59 of this title:
(1) Secretary of the Department of Transportation;
(2) Director of the Transportation Authority;
(3) Director of the Division of Highways;
(4) Director of the Office of Administration;
(5) Head of the Office of Financial Management and Budget;
(6) Chiefs of such other divisions or administrations as may be established by the Secretary with the written approval of the Governor; and
(7) Head of the Office of External Affairs.
(8) Director of Division of Pre-Construction.
(9) Director of Motor Vehicles.