Concessional mass limits
(1) The concessional mass limits apply as an exception to the
general mass limits as stated in subsections (2) to (7).
(2) Subject to subsection (3)(a) and (b), the mass of the heavy
vehicle must not be more than the lower of the following—
(a) 5% more than the maximum mass permitted for the
heavy vehicle under the general mass limits;
(b) if the heavy vehicle is fitted with a tandem axle group or
tri-axle group—the mass determined by applying
section 2 of Schedule 1 with the amount stated for the
group in Table 1 of Part 2 of the Schedule changed to the
mass exception amount for the group mentioned in
subsection (4).