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They also have abundant signs pointing to where they are. I even saw one that had a blue flashing light on top, with a large speed limit sign next to it.

If you get caught by that, you really need to pay more attention.

As someone who hates speed cameras, I would actually like them if they were more like what you've described.

* Clearly marked, by law.

* Placed for safety, with some clearly defined legal criteria.

* No data retention, by law.

If I recall correctly, they are now also only allowed to be placed where road accidents have happened before.