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MOTOR VEHICLES (STANDARDS) REGULATIONS - AUSTRALIAN VEHICLE STANDARDS RULES
163Mounting of fifth wheel couplings on B-doubles and road
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163 Mounting of fifth wheel couplings on B-doubles and road A fifth wheel coupling must be mounted on a prime mover, or a semi-trailer used in a B-double or road train, in accordance with Australian Standard AS 1771-1987 Installation of Fifth Wheel and Turntable Assemblies.