National Transport Commission (Road Transport Legislation – Vehicle Standards) Regulations 2006
171Tow coupling overhang on road trains
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171 Tow coupling overhang on road trains
(1) In this rule:
tow coupling overhang, of a vehicle, means the horizontal distance from the centre of the axle group, or the centre line of the single axle, at the rear of the vehicle to the pivot point of the coupling near the rear of the vehicle.
(2) The tow coupling overhang of a motor vehicle, except a prime mover, used in a road train must not be more than the greater of: (a) 30% of the distance from the centre of the front axle to the centre of the axle group or single axle at the rear of the vehicle; and (b) 2.7 metres. (3) The tow coupling overhang of a semi‑trailer, or a dog trailer consisting of a semi‑trailer and converter dolly, used in a road train must not be more than 30% of the distance from the point of articulation to the centre of the axle group or single axle at the rear of the vehicle. (4) The tow coupling overhang of another dog trailer used in a road train must not be more than 30% of the distance from the centre of the front axle group or single axle to the centre of the axle group or single axle at the rear of the vehicle.
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Tow coupling overhang—semi‑trailer with extra coupling at rear
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Tow coupling overhang—motor vehicle
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Tow coupling overhang—dog trailer