SA Government Gazette - No. 80 8 December 2016 - p4925
South Australia Australian Road Rules
Part 16 -- Rules for persons travelling in or on vehicles
270--Wearing motor bike helmets
1
The rider of a motor bike that is moving, or is stationary but not parked, must--
(a)
wear an approved motor bike helmet securely fitted and fastened on the rider's head; and
(b)
not ride with a passenger unless the passenger complies with subrule (2).
 
Offence provision.
 
Note-- Motor bike and park are defined in the dictionary.
1A
However, the rider of a motor bike that is moving, or is stationary but not parked, is exempt from wearing an approved motor bike helmet if--
(a)
the motor bike's engine is not on; and
(b)
the rider is pushing the motor bike; and
(c)
in the circumstances, it is safe for the rider not to wear the helmet.
 

Note - 1A inserted by 274/2016 r 24 8.12.2016

2
A passenger on a motor bike that is moving, or is stationary but not parked, must wear an approved motor bike helmet securely fitted and fastened on the passenger's head.
 
Offence provision
3
In this rule--
approved motor bike helmet means a protective helmet for motor bike riders that is approved, for the Australian Road Rules, under another law of this jurisdiction.
 
SA Note--
 
For South Australia, see regulation 38 of the Road Traffic (Road Rules--Ancillary and Miscellaneous Provisions) Regulations 2014.
 
passenger, of a motor bike, includes a person on a passenger seat of the motor bike (including the pillion seat), or in a sidecar.

Note
The SA ARR was updated in July 2004, Gazette 56 31/7/14 then amended as per rule 1A above in 2016.