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At a guess I’d say they are just traffic cameras, similar to the ones used for smart motorways. No signs for speed cameras and no need there for anpr
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When I was LGV driving for a living (and in my car) I ignored them all and never bothered to ask what they were because I found that if I stuck to the law then there was no need to do so …
those are the ones to catch truckies pointing a cameraphone at them… 
Lol nah its off Google earth so it’s okay, just was curious what the different cameras are
Wouldn’t be surprised if they are linked to a drive over weigh system which they have around Markham Moor on the A1 and numerous other places.
Not speed cams in the sense of sending you a government invoice for exceeding your speed overdraft.