In order to provide an economical and efficient system for transportation of Federal Government personnel and property consistent with , the purposes of this subchapter are—

((1)) to establish procedures to ensure safe operation of motor vehicles on Government business;

((2)) to provide for proper identification of Government motor vehicles;

((3)) to establish an effective means to limit the use of Government motor vehicles to official purposes;

((4)) to reduce the number of Government-owned vehicles to the minimum necessary to transact public business; and

((5)) to provide wherever practicable for centrally operated interagency pools or systems for local transportation of Government personnel and property.