How do you get pinged by NSW fixed speed camera?

Just got back from nearly a week in Northern NSW. Very 
pleasant holiday, some very windy roads (should have video'd 
some of them), and some very fantastic views.
First speed camera we encountered, down near Kyogle 
somewhere, noticed the huge warning signs, etc, and 
commented about it to the missus. No sooner had I said "I 
dunno how anyone could be stupid enough to get caught by one 
of these", and some stupid appears out of nowhere behind us, 
overtakes on double white lines, and zooms through the speed 
camera site (80 zone, estimate a bit over 100). Sure enough 
the camera flashed.
Yup, there's some stupids around, and we share the road with 
them.
The few fixed cameras I saw, certainly made more sense than 
the QLD method of hiding them. Except for the idiot above, 
they seemed to do a good job of making sure everyone had 
slowed to a respectable speed. The places where they were, 
were places where excessive speed could be particularly 
dangerous, so IMO they were well placed.