On M 62 Westbound between j12 and j11 I got nip for doing 72 in 50 variabile speed. Problem its gantry whit speed limit its after their camera (can be seen in their own evidence) Can a speed limit by enforced before gantry showing that new speed?????
You need to check where the variable actually starts and where it finishes.
Mistakes do and of course can occur, but with the variables it is rare to be honest, so double check where the average limit started and finished and then your question can be answered more accurately.