Two points on circles, back in PA there is one in Easton, PA, that to this day I have no idea how to use it. They actually have TRAFFIC SIGNALS on it, with only red and yellow lamps! I avoid it a all costs. They converted the intersection of route 29 and 73 to a circle a few years ago, and I must say it improved traffic flow considerably. I need to point out it is SINGLE LANE WIDE, and I believe this is the reason it works so well.
I would be a very interesting experiment to take traffic cones, and convert the existing TV circles to SINGLE LANE. I think this would eliminate a lot of problems.
Just my thoughts.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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