Motor Vehicles (Standards) Regulations - Australian Vehicle Standards Rules

On a semi-trailer or a dog trailer:

the distance between the point of articulation at the front of the trailer and the rear overhang line must not be over 9.5 metres;

and

the distance between the point of articulation at the front of the trailer and the rear of the trailer must not be over 12.3 metres.

A projection forward of the point of articulation at the front of a semi-trailer must be contained within a radius of 1.9 metres from the point of articulation.

Maximum dimensions of a semi-trailer

If a semi-trailer has 2 or more points of articulation at the front of the trailer, it must comply with subrules (1) and (2) when measured at one of the points.

A trailer built to carry cattle, sheep, pigs or horses on 2 or more partly or completely overlapping decks must not have over

12.5 metres of its length available for the carriage of animals.

For subrule (4), 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.