At least the traffic moves... In our area we recently gained a 3-legged roundabout and damned if half the people can't figure it out. Plenty of markings, yield signs, and lots of press so people knew what to expect and how to negotiate it. A year later and I have seen both the bewildered come to a halt in the middle of the thing yielding to cars queing up, or my other favorite: I come charging down the hill entering the thing and the car in front of me comes to a full stop at the entrance with absolutely no one around <crickets chirping>.