And as one who has had direct practical experience of the Victorian (Australian state, although perhaps applies to their approach to speeding enforcement) the general policing approach seems to me to be to set up speed TRAPS - and I don't use the word lightly - and use them as revenue generators.
Two examples. First, an officer with a speed gun *just* (30 / 40 metres or so) inside a 40kph limit. Second, a 5 x 5 inch "40" kph sign of the temporary type seen at roadworks, about 5 yards before a crest. Normal limit 110kph (standard for rural roads). At the bottom of the other slope of the crest was a speed trap, catching those who'd not slowed to the temporary limit at the top of the crest.
In my example, I ended up with a ticket for doing 62kph - but as I was leaving Australia inside the 28 days I had to pay I still have the ticket, and the reminder appears to have gone mysteriously astray. If I get stopped in Victoria and a warrant check is done, I may end up paying A$350 or so.
And the kicker - if it hadn't been a rental car it would have been confiscated. Leaving me a considerable distance from anywhere with decent transport links...