Good. There to save lives.
Bad. There to make money.
Don't care as long as I don't get nicked.
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I don't think they would need to be painted yellow (traffic lights) as there is no 'capture' involved - the light could measure the speed of approaching traffic, and if it was exceeding the speed limit then the light would turn red and stop the traffic. There would be no 'enforcement' aspect to it, so no need for the camera to be yellow.