I think this is the basic state by state requirements as they stand at the moment. At least in SA consumer law (AS1698:2006) and road rules conflict. (AS1698:1988)
I haven't gone to far into all this but I gather the petition is about getting a national standard implemented because at the moment it seems a compliant helmet sold in e.g. Qld doesn't comply in NSW because of missing sticker.
http://www.mrasa.asn.au/pdf/MotorcycleHelmetStandards.pdfNT: Helmets must comply with AS/NZS 1698:2006 (from 1 Jan 2012).
Qld: Helmets must comply with AS 1698–1988.
NSW: Helmets must comply with AS/NZS 1698:2006 and bear a sticker from a JASANZ
accredited certifier (5 Feb 2010, 5 Nov 2010).
ACT: Helmets must bear the certification trade mark of which the Standards
Association of Australia is the registered proprietor together with the figures “1698”
(reconfirmed 2009).
Vic: Helmets must be marked with an official standards mark, comply with AS/NZS
1698:2006 and bear a JAS-ANZ certifier sticker (1 July 2012).
Tas: Helmets must comply with AS/NZS 1698 (NB: no year) and bear the Australian
Standards Mark (1 July 2012).
SA: Helmets must be manufactured, tested and marked in accordance with AS
1698:2006 and bear the certification mark of the Standards Association of Australia
(28 Nov 2007).
WA: Helmets must comply with AS/NZS 1698:2006 and carry a sticker issued by
Standards Australia (14 Dec 2007).