veiw this pdf... it will provide you with some tips and hints in abiding by the laws in QLD.
http://www.transport.qld.gov.au/qt/LTASinfo.nsf/ReferenceLookup/Modification_Jan05v2.pdf/$file/Modification_Jan05v2.pdf
hope this helps some.
cheers.joe.
EDIT.. MAYBE WE COULD PIN/STICKY this sorta post and have all info reguarding to the laws for all states in this thread.