M8 Specs cameras - BobbyG
A slightly different angle on this.

On the M8 going through Glasgow there are roadworks which are 40mph and are being governed by SPECS cameras. However, there is a SPEC at the beginning and one at the end.
So if like me you are driving the full length of it, then you need to keep to the speed limit.

However if you are a motorbike (and thus no front number plate), or if you join at the various junctions in between the two cameras, then you don't need to keep to the speed limit!
So you therefore have some cars sticking to 40 mph and others weaving their way in between.
Makes for some interesting driving!

Although I would not in any shape or form try to test my theory out, there is part of me that says I wonder if these cameras are real? Unless you know someone "in the know" then these cameras will do the same job whether they are real or not!
M8 Specs cameras - mr.freezer
The A90 between Perth and Dundee has got two sets of roadworks with the same cameras.

Whenever there was roadworks there in the past the tailbacks were bad, but this set up seems to work fairly well.

On the subject of whether they are real or not, I too have not heard of anyone getting done by these cameras anywhere up here or by the ones dotted along roadworks on the M6 etc.

The benefit of these cameras to me are that you can sail along at around 44 mph and cruise past the 40 mph people and know you won't get done.