Here you go...
The law is:
Quote:
Road Safety (Vehicles) Regulations 1999 - SECT 222
Affixing number plates
222. Affixing number plates
(1) A registered operator of a registered vehicle must ensure that each number
plate issued by the Corporation for the vehicle is permanently affixed to the
vehicle so that (assuming the vehicle to be on level ground)-
(a) except as set out in subregulation (3)-
(i) the number plate is at all times in an upright position parallel to
the vehicle's axles; and
(ii) the number plate is at all times not more than 1×3 metres above ground
level; and
(iii) in the case of a motor cycle-the centre of the number plate is at all
times not less than 30 centimetres above ground level; and
(b) except as set out in subregulation (3), the numbers or letters (or
both) on the number plate are clearly visible from a distance of 20
metres from the number plate at any point within the space produced by
a horizontal arc of 90° and a vertical arc of 45°, as indicated by the
shaded areas in figures 5 and 6; and
(c) any cover on the number plate-
(i) is clear, clean, untinted and flat over its entire surface; and
(ii) has no reflective or other characteristics that would prevent the
successful operation of a device approved for use under a law relating
to the detection of traffic offences; and
(d) in the case of a motor vehicle other than a motor cycle-one number
plate is affixed to the front of the vehicle and another to its rear,
except as provided in subregulation (2); and
(e) in the case of a trailer or motor cycle-the number plate is affixed to
its rear.
(2) If a vehicle is fitted with a bicycle carrier, the number plate otherwise
required to be fitted to the rear of the vehicle may instead be securely
affixed to the bicycle carrier.
(3) Paragraphs (a) and (b) of subregulation (1) do not apply to a number plate
of a vehicle if-
(a) due to the construction of the vehicle it is not practicable to comply
with those paragraphs; and
(b) the number plate is affixed in a manner that complies as far as
practicable with those paragraphs.
(4) For the purposes of subregulation (1), the obligation to have a number
plate affixed to a vehicle includes a requirement that if-
(a) a motor vehicle is towing another vehicle that is not required to be
registered; and
(b) the towed vehicle obscures the rear number plate of the towing
vehicle-
the registration number of the towing vehicle is displayed, by painting or
otherwise, on the rear of the towed vehicle in accordance with the
requirements of subregulation (1)(b).
(5) For the purposes of section 72(3) of the Act, a person who displays a
registration number as required by subregulation (4) is using the identifying
number in prescribed circumstances.
(6) If a vehicle is used on a highway without bearing number plates affixed
and displayed in accordance with this regulation, the driver of the vehicle
and the registered operator of the vehicle are each guilty of an offence.
Have a look around here if you need any help...http://www.trafficlaw.com.au/
The online forum is a good place to start..
Shaun
This also has a list of ADR requirements -
http://agsearch.ag.gov.au/clsearch/home?query=Australian+design&new=1