A13 Average Speed Cameras
Discussion
edwardbtz said:
Last night I was coming back in London and as you know the speed limit before the sign is 70, while I passed the entry cameras with 70 then I braked suddenly to 50, I was wondering if I would get a fine, I can mention that I braked right after the cameras 
Average speed cameras work by calculating your speed between two fixed points (i.e. between two sets of cameras). These cameras do not measure instantaneous speed, therefore breaking for them won't make a difference.
Based on your screenshot, the cameras are the first set in the 50 limit, therefore it won't matter if you passed them at 70. As long as your average speed between this set of cameras and the next is within the prosecution threshold (usually 50 + 10% = 55) you won't get a ticket.
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