You may be required to comply with this standard if you intend to operate a B-double or road train. Fifth wheel couplings and turntables used in your B-double or road train must comply with this standard.
This standard sets out the attachment design forces for fifth wheel assembly and equations to determine the required D-value of components for various combinations. This standard applies to fifth wheel assemblies used with 50 mm, 75 mm and 90 mm kingpins, and associated equipment for articulated vehicle combination, used in heavy road vehicles, B-doubles and road trains, in normal use on both sealed and unsealed roads.
The particular version of the standard you must comply with is AS 1773-1990 Articulated Vehicles - Fifth Wheel Assemblies. Please consult the Contact Officer for more information and to ascertain the level of compliance (if any) that may be required.