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It's not that simple, trust me. :)
*cue hippy going on the Internet and researching the hell out of it.* :)
The difficulty doesn't lie so much in the technology and its applications, but in the political opposition. For instance, when officers set up traffic control points, there are some self-appointed vigilantes around who will question every aspect of the set-up and whether they're recording speeds correctly, etc. Campaigners against speed cameras have also in the past put up such opposition (often exploiting problems with legislation) that officials were tied up just dealing with it all, and speed camera provision was watered down, e.g. with warning signs and what have you.
That's not to say such enforcement shouldn't happen, only that there's a bit of history. Not knowing about Australia, my guess would be that primary legislation there is very different, and quite likely more up-to-date. In the UK, much still relies on the 1835 Highways Act. :)
So is enforcement in Australia also done in the dense cores of older cities? That's obviously where it's most difficult.
I've never read up on enforcement in Australia, so don't know much about it.
As you know, there are speed cameras in the UK, too, e.g. on motorways etc., but they have come under fierce political attack in the past and form part of a very sorry saga.