Western Australian Consolidated Regulations Western Australian Consolidated Regulations (1) A combination must
not be over —
(a) for
a B-double — 25 m long;
(b) for
a road train — 53.5 m long;
(c) for
a combination, except a road train, designed to carry vehicles on 2 or more
partly or completely overlapping decks — 25 m long; and
(d) for
another combination — 19 m long.
(2) In a B-double
built to carry cattle, sheep, pigs or horses, the 2 semi-trailers must
not have over 18.8 m of their combined length available for the carriage
of animals.
(3) For
subrule (2), the length available for the carriage of animals on a
trailer is measured from the inside of the front wall or door of the trailer
to the inside of the rear wall or door of the trailer, with any intervening
partitions disregarded.