The helmet regulations are set directly in part 2 of the Road Rules Act, Rule 8
There were no known gazetted regulations approved by the Registrar allowing other standards until the gazette below.
APPROVAL OF HELMETS FOR USE
BY PERSONS ON MOTORCYCLES
I, PAUL NATHAN RAJAN, Registrar of Motor Vehicles,
approve any helmet that complies with Australian Standard
AS1698-1988 "Protective Helmets for Vehicle Users" as a
helmet of an approved type for the purposes of regulation
8(1)(b) of the Traffic Regulations and the definition of
approved motor bike helmet in Australian Road Rule 270(3)
Dated 20th September, 2013
P. N. RAJAN
Registrar