In order to provide an economical and efficient system for transportation of Federal Government personnel and property consistent with section 101 of this title, 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.