You will be required to comply with these standards if you intend to manufacture or modify a heavy vehicle that will be used in a B-double or road train. Specifically, these standards refer to the testing and installation requirements of fifth wheel and turntable assemblies.
Australian Standard AS 1773-1990 Articulated Vehicle - Fifth Wheel Assemblies specifies the functional and testing requirements of fifth wheel or turntable assemblies. Australian Standard AS 1771-1987 Installation of Fifth Wheel and Turntable Assemblies specifies the requirements for mounting or installing a fifth wheel or turntable assembly.
Please consult the responsible agency for more information and to ascertain the level of compliance that may be required.