I have no problem with the cameras, just with the deceipt - the way they stick the 'speed camera in use' sign practically underneath the front bumper for example. Law requires them to display it, but not for it to be VISIBLE.
on the other hand, its saved me a couple of times coming the other way, good ol lights relflecting off of it.
FNQ also has 4 or 5 VE Commodores fitted with side-mounted LIDAR's - they look like a rollcage extended from the car about a foot towards the centre of the road, with a tube on it. Very easy to spot, they're not undercover.
Cairns has a variety of undercover cars - but 90% of them are VE Commo SV6's, Aurions, Camrys and Falcons. Majority are blue or red, but theres a few gold/silver ones. Small black boxes in the windscreen are a giveaway too - there should be two just behind the wipers, and one long one across the top.
Thats about it of my expertise

Pop around to your local Police HQ at some point and just scout out a couple of cars. Works a treat, you learn to spot signs, and you can always memorise plates.
EDIT: Oh, and if the guy in the car behind you reaches to change his mirror but doesnt...he's about to pull you over. The switches for lights/sirens in most undercover cars (and some normal squad cars) (at least in my area) are behind the center mirror, similar to where the Lancers interior lights are.