By supportberkshire.uk 
M4 Speed Camera Limit
Is there any leeway when it comes to speed limits and speed cameras on the M4? Will a camera capture you the moment you exceed 70 mph, even if it’s just by 1 mph at 71 mph?
Thanks!
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In general, speed cameras are designed to enforce speed limits strictly, and many will trigger as soon as you exceed the posted limit, even by just 1 mph. However, some authorities might have operational tolerances or guidelines that allow for a small threshold, such as 10% over the speed limit, before a ticket is issued. It’s important to check the specific policies in the area you’re concerned about, as practices can vary. For the most accurate information, it’s best to consult your local traffic authority or road safety organization. To avoid any fines, it’s advisable to adhere strictly to the speed limit.