UK Traffic Law
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Sorry for the delay.
No, no camera is always on.
They are turn off for lots of reasons. Some are routine maintenance. Some are not ever functional. Some are malfunctioning for the reasons that technology does sometimes.
Generally speaking, average cameras are more likely to be efficient because there are larger number of cameras so there would need to be more than one defaulting but that does happen sometimes.
Can I clarify anything for you?
Do you mean the gantry signs?
If so, they are not usually cameras. They are just warning speed limits signs.
Those are average speed cameras but they do not detect the signs on the gantry. They detect those who are over 70 mph as that is the national speed limit.
The gantry signs are advisory only rather than an instruction. That is why they are allowed to be variable
I suppose it is possible that they could argue that a person who is vastly over the speed limit in the gantry signs is driving without due care but they are not speeding unless they go over the national speed limit.
Gantry signs don't meet the criteria for a reduction the national speed limits.
Yes, you could if it was operative.
It doesn't matter whether there was a speed limit displayed. If there was none then national speed limits would apply.
Average cameras only work if you pass more than two as they measure the speed by the time it takes to travel between the two.