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Something I've seen a lot in Europe is speed cameras in places that have a specific good reason for people to slow down. Several seconds before encountering the camera is a sign with the speed limit and a camera icon or the word "radar". The purpose isn't to issue tickets, but to get people to slow down for the dangerous section of road.

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Some are there because they need to be, some aren't. In my country most of them aren't there to keep you safe but to have a revenue stream.

I know a couple of signals that are there to just make people slow down, and they work even if a lot of us know that there's no radar there.

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