If they are displaying a speed the camera should be active also.
But as you approach the gantrys, look on the opposite carrigeway you can see the cameras attached to the gantry on the opposite side, that means there is some on the gantry along side it on your side.
I live at j28 of the m1 I use the motorway quite abit, just slow down through them wheel the speed is displayed! I never trust the cameras even if they are off to be honest!
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