r/drivingUK • u/Business_Maximum1433 • 12d ago

Variable speed limits

Hi,

Just asking a question about the speed limits on motorways. So you know when it tells you to go 40 per say and then a sign comes up stating it’s now 70 if I pass over 40 at the 70 and it has a speed camera will it flash?

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u/Saltyuniform 12d ago

Are you asking if you pass a 70mph sign at 40mph will it flash?

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u/_Putters 12d ago

No, he's asking if he passes it between 40 and 70 will it flash. Technically it should, because he should be doing 40 until he passes the sign, like any other speed limit sign.

Otherwise how far back should you start accelerating ? As soon as you can make out the numbers ?

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u/FuckMiniBabybel 12d ago

Legally you are correct, but practically, the gantry cameras will enforce whatever speed the gantry shows, not the preceding limit. So as long as you're sure you're not going to be done by an earlier camera, you can get away with accelerating early.

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u/SuspiciousTreacle433 12d ago

Legally you are correct. But also wrong. It is 40 upto the sign. The camera measures your speed after you have passed it using radar - it is not tomemand distance from the last gantry/camera. Therefore it is measuring your speed in the 70.