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I always wondered if you could put a circuit near your license plate that detects a flash and sets off its own flash to over-expose the image.

It might help at night at least. What do you folks think?

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I think so. That tech exists in the photo world.

Alternatively, you could cover your plate with a hyper reflective coating which would likewise overexpose the plate.

I think that exists as a spray. Basically a clear coat, but highly reflective.

I don't know if this one is legit, but I've heard of at least one brand that is. http://www.photoblocker.com/

I think the problem with this sort of scheme is field testing. Short of getting hold of a traffic camera (which sounds difficult), a meaningful test invokes breaking the law with all the attendant problems.

edit: traffic camera, not speed camera.

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