My introduction to them was years ago in Australia. After a few weeks of learning to use them in Sidney it seemed like a breeze when I ran into a few in the USA. It can still be tricky the first time through one. I have been through a couple that have 5 or 6 exits and that is difficult in the rain. Both times I just kept going around until I was sure of my exit from the roundabout. My wife was the only one that knew and she got a good laugh out of it.