The objects of this Act are:
(a) to provide for the registration of vehicles used by the Commonwealth and Commonwealth authorities; and
(b) to exempt from taxation by a State or Territory:
(i) the sale of certain DASFLEET assets; and
(ii) certain leases of vehicles to the Commonwealth or Commonwealth authorities; and
(iii) the registration (under a law of that State or Territory) of certain vehicles leased to the Commonwealth or Commonwealth authorities.