A question often asked in the Australian Cycling Forums is do demerit point offences apply to cyclists in Australia. Well in the case of Western Australia the answer is simply no.
The Road Traffic Act 1974 section 104A states:
104A. Demerit point offences in WA
(1) The regulations may prescribe an offence under this Act as a demerit point offence in WA, and specify the number of demerit points applying to the offence.
(2) An offence cannot be a demerit point offence in WA unless it involves the driving or use of a motor vehicle.
(3) Regulations referred to in subsection (1) may distinguish between offences according to the circumstances in which they are committed.
[Section 104A inserted by No. 54 of 2006 s. 31.]
The key point is 104A(2) which states that an offence cannot be a demerit point offence unless the offence involves the driving or use of a motor vehicle. Bicycles, being human powered vehicles fall outside this definition.