In my area (US) there is a great hue and cry about putting in roundabouts to replace signaled intersections. The local zealots are all atwitter that roundabouts don't need signals and will keep rush hour traffic moving. Having travelled a bit in Commonwealth countries, I recall encountering a lot of roundabouts with signals added to them, precisely because they DON'T handle high volume traffic well. Any thoughts on this from our British brethren and sistern? Am I wrong on this?