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They *only* don't work on high traffic when traffic doesn't know what to do. When in Australia last summer (07) I drove through 2 laned roundabouts. I was also a passenger in 3 laned roundabouts. We didn't slow down (much), speed limit was 30kph through the roundabout anyways. But big trucks, buses, cars, all moved through it from 5 (!!) different points, using all 3 lanes. People just knew to be in the lane they wanted BEFORE they got to the roundabout, so there wasn't people switching lanes when they reached it and in it.
It worked. Roundabouts only flaw are the drivers. IF people don't know how to use them, they will be slower than a stop light.
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