G'day Murray,To drift completely off topic ... you may have identified an Australian Cultural Oddity - the tendency for roads to change name (and street numbering) at every municipal boundary whilst keeping a spare name hidden up the sleeve: e.g. City Road, Darlington / King Street, Newtown (all Princes Highway).
All this must seem very foreign to Americans who can have an avenue ... with street numbers in the mid thousands!
Regards,
Bob Bolton