I had a trip to Wales last weekend for a party. I didn't think about the 20 limit until I got off the M4 and didn't spot any 20 signs for half a mile or so; but everyone was doing 20 anyway. I then trundled along an A-road though a few villages for about 10 miles. I came back up the valleys to the A465 because the Newport tunnel was closed eastbound for the weekend. Things I noticed:
- Some people religiously stuck to the 20 and occasional 30 limits but then didn't really speed up in 40 and 60 limits. Easy enough to overtake but it's bizarre being the fastest car on the road at less than 60 and below the speed limit.
- A lot of the 20 limits have new 40 and 30 limit sections either side so you don't go 60-20. Very sensible; I've always thought the French did this well on rural N-routes when they pass through villages.
- An awful lot of the 20 signs were defaced already in some places. My car read one that had the 2 sprayed over as 80 and started accelerating me

- Early Sunday morning going up the A469 to Rhymney there was mass disobedience; virtually nobody going at 20. It was along this road that the 20 limits seemed most intrusive as well; maybe not a coincidence.
Oh, and the A40 between Abergavenny and Raglan had temporary 50 limit signs all along it, but no roadworks or any other reason for them to be there. Again, mass disobedience.