(3) However, this Chapter recognises that the use of particular
heavy vehicles that do not comply with the mass
requirements, dimension requirements and other requirements
mentioned in subsection (2)(a) to (c) may be permitted on
roads in particular circumstances and subject to particular
conditions—
(a) to allow for—
(i) the efficient road transport of goods or passengers
by heavy vehicles; or
(ii) the efficient use of large heavy vehicles that are
transporting neither goods nor passengers and need
to use roads for special uses; and
(b) without compromising the achievement of the purposes.