90
Thousands of drivers tricked by fake 50mph sign on A20 must pay fines, say police
(www.standard.co.uk)
"who’d a thunk it"
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They're quite common, and they're very effective, as you can't speed then brake to avoid the camera.
For example, if you're on a motorway with roadworks, and a temporary 50mph limit in place, you'll very rarely see anyone doing more than 53, because they know they'll get a ticket.
You won't get a ticket until you average 60 in a 50 limit on motorways. Motorway speed cameras don't trigger until 10mph above. If it's one of the smart motorways and it's running the national speed limit, they won't trigger until 90.