> From what I've seen, roundabouts/traffic circles work just as well. They do not. Traffic circles work best for diffuse, medium-level traffic that appears co

> From what I've seen, roundabouts/traffic circles work just as well. They do not. Traffic circles work best for diffuse, medium-level traffic that appears continuously without burstiness and is roughly even to all exits. When you have "rush hour overload on one direction" (which describes 90% of the US intersections with problems) traffic circles range from worthless to actively harmful. Traffic lights work much better in those situations. And, at other intersections, anything will work including removing traffic controls. Traffic engineering is all about tradeoffs.