Canada

Speed cameras are really good at stopping speeding in their direct area, whether or not someone speeding likes them. Their downfall is they usually are installed by private companies who manage them, and the contracts are paid for by tickets. Since the cameras do such a good job stopping the speeding, the city stops getting ticket money and starts having to pay the companies out of pocket. We've been using police to do traffic stops for longer and it hasn't really worked the same way. (And cops cost waaaaaaay more).

One study from New York

But a quick search found many studies from all over the world.

I bet that person speeding through the construction zone learned a valuable lesson about risking their and other people's lives for 30 seconds faster arrival times. Also I cant imagine being so distracted while driving that I would miss a traffic camera and the signs that almost always proceed it ten times. Plus the flow of traffic would likely be slowing as more observant drivers saw the camera, which you'd have to ignore and presumably pass aggressively whilst shouting angrily about other people being bad drivers.

Shoot, not to beat this point too much (too late), but it's also a construction zone which typically has tons of speed signs plastered everywhere.. maybe they deserved the 10 tickets in two weeks and they're just mad because if we relied on cops they would have gotten away with it.