Arc said:
Yes, so stick below the speed limit if you dont want to be caught

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That actually, is easier said than done. For one, sticking to a speed limit is simple on a straight, narrow road. You just relax your foot when you reach <30.
However, it all changes when going down hills, overtaking, filtering through traffic, going down lanes. Many a time I accelerate up to a speed in which I feel safe, notice it's above the limit, so I decelerate back down. Dangerous? I don't think so, as my eyes were where they should be - on the road, not on the dashboard. It doesn't matter if I'm constantly checking my speedo, because we all know that as long as I don't go above the limit, I'm not going to get into trouble with the law. Getting into trouble with the curb, or a hedge is a different matter though.
I'm sure that if I had my eyes glued to the speedometer I wouldn't of gone over the limit all these times for a few moments. However, my eyes wouldn't of been on the road, where they need to be.
I don't consistently speed, I was done for doing 36 in a 30 after coming down a hill and not looking at the speedometer, I was more concerned with looking up at the road and tapping my brakes as I negotiated a number of downhill corners. I passed a speed camera van at the bottom, not even realising that I was speeding as I thought I had navigated the road carefully and safely, so I was annoyed when prosecuted for breaking the law by effectively concentrating on driving instead of religiously watching the little needle on my dial. IIRC I even braked a few times to keep my speed down, but we all know how a hill adds to a car's speed very easily.
I'm not anti speed cameras. I think they're great,
provided they're properly placed and calibrated to monitor a realistic speed.
A 30mph camera outside of a school is perfectly fine, but a 40mph camera van above a dual carriageway fit for 60, isn't.