Notwithstanding any other provision of this Act, nothing in Part 1 shall apply to—
(a) any motor vehicle whose motive power is always wholly derived from petrol and whose gross laden weight is 3.5 tonnes or less; or
(b) any trailer whose gross laden weight is 3.5 tonnes or less; or
(c) any motor vehicle that is exempted from Part 1 by regulations made under this Act.
Section 4(a): amended, on 23 November 1979, by section 4(1) of the Road User Charges Amendment Act 1979 (1979 No 65).