What effect, on average, do traffic signal cameras have on safety?
(a) Cameras have no effect on the rate of accidents.
(b) Cameras decrease the rate of accidents.
(c) Cameras increase the rate of accidents.
The answer is here.
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prior probability 
I have not checked the answer yet but my guess would be that cameras c increase the rate of accidents. I say this because now you aren’t focused on the road but on the camera causing people to break more frequently, take their eyes of the road, etc.