HADECS speed cameras - distance question?

If travelling towards a speed camera well aware of its presence and travelling below the speed limit (70mph limit, doing 60-65mph) passing the grey cameras about 200m before the yellow gantry box unit and continuing past it for over 30 seconds still below the speed limit but then breaking the speed limit suddenly... show more If travelling towards a speed camera well aware of its presence and travelling below the speed limit (70mph limit, doing 60-65mph) passing the grey cameras about 200m before the yellow gantry box unit and continuing past it for over 30 seconds still below the speed limit but then breaking the speed limit suddenly (legitimately to avoid being crashed into by a swerving car) would the camera likely still detect the speeding or is it moreso measuring the speed between the grey cameras and the yellow box. Basically roughly how many metres past the yellow box is it likely to detect speeding? Thanks
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