National Transport Commission (Road Transport Legislation – Vehicle Standards) Regulations 2006
161Selection of fifth wheel couplings for B‑doubles and road trains
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161 Selection of fifth wheel couplings for B‑doubles and road trains
(1) A fifth wheel coupling used in a B‑double or road train must have a D‑value complying with Australian Standard AS 1773–1990, Articulated Vehicles—Fifth Wheel Assemblies. (2) A turntable used in a B‑double or road train must have a D‑value complying with Australian Standard AS 1773–1990, Articulated Vehicles—Fifth Wheel Assemblies. (3) If a fifth wheel coupling used in a B‑double or road train is built for a 50 millimetre or 90 millimetre kingpin, the coupling must: (a) meet the dimension requirements in Australian Standard AS 1773–1990, Articulated Vehicles—Fifth Wheel Assemblies; and (b) not be worn away more than recommended by the standard. (4) If a fifth wheel coupling used in a B‑double or road train is built for a 75 millimetre kingpin, the coupling must: (a) be compatible with the kingpin mentioned in rule 165(3); and (b) not be worn away so that it does not comply with rule 162.