South Australian Current Regulations South Australian Current Regulations31—Carriage of trade plate and trade plate label
If a motor vehicle is to be driven on a road pursuant to section 66 of
the Act—
(a) a
trade plate must be securely attached to the rear of the vehicle in such a
position that the bottom edge of the plate is not less than
30 centimetres above the level of the ground; and
(b) the
label issued by the Registrar in respect of the trade plate must be displayed
in a waterproof holder that has a transparent front and is affixed to the
plate; and
(c)
every figure and letter on the plate and label must be—
(i)
legible from left to right on a plane level with the
ground; and
(ii)
clean and legible at all times; and
(d)
every figure and letter on the plate must be clearly visible in daylight to a
person standing on the same plane as the vehicle at any point not less than
3 metres or more than 18 metres from the plate, looking at the plate
along an imaginary line approximately at right angles to the plate.