Found this on a FAQ
"Q: I have been flashed by a Gatso on the opposite side of the road when driving towards it? Am I likely to be prosecuted?
A: No. A Gatso camera can only catch vehicles travelling away from it. When there is no film in a Gatso, the trigger threshold for a flash is often lowered, and the camera may be set to also flash approaching vehicles. This is what gives rise to the phenomenon you have observed.
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