I drive a lot through the Woodford area in North London, and there is a particular stretch just after you pass the A406 that is 30mph, but I know there aren't any GATSO, the road is wide and visibility is good and you would easily see plod if they were waiting
What I have noticed are three lines in the road similar to the speed trap "DS2" - so I never take my chances. What beats me is why people don't overtake and sit up against my backside, flashing furiously at my door mirror. I always tuck to the left and my side of the road is so wide you could overtake without crossing the centre line
My point being, if a road is suitable for speeds greater than the posted speed limit, it should be suitable for an overtake, too (unless the other side is busy - in which case it's not safe to exceed the limit , given the intelligence of pedestrians)
