thetruthaboutcars.com has a post that uses this photo from China.
The ironic thing is that it shows you some truth about buses too, as the gridlock depicted is clearly caused by buses blocking exits from the traffic circle. Where there are no buses, there's traffic flow. The buses form bigger barriers on traffic circles.
The solution to this particular problem is not getting rid of buses, of course. Its installing signals to stop traffic from coming on to the circle when things get blocked.
I like traffic circles, but there a bit tough for pedestrians, especially handicapped people, to navigate. Signals can help there too, of course. The so-called modern roundabout has this and other features. Wikipedia has an interesting article about them.