In the east, like New Jersey, they are eliminating these roundabouts because they are a major cause of traffic congestion.
Yes, the average motorist has no clue what to do in these traffic circles, either coming to a complete stop (causing accidents), not yielding (causing accidents) or not being in the correct lane to depart the traffic circle (causing accidents).
The roundabouts are fine for light traffic, but once levels rise beyond a certain point, they become nightmares.
It might be almost superior if all the intersections to it were four way stops. Then everybody would know to stop and there’d be no guessing.
The end result, a population of drivers who are all weather, all terrain, and all conditions of visibility trained, knowledgeable, and capable. There is a reason why the country that invented the motorcar, really invented the superhighway, manages it all so well even with unlimited speed limits in places.
The fault ain't in the roundabouts.
I was discussing roundabouts at work yesterday with a couple of Brit colleagues. They told me that the UK is installing traffic lights on the most congested roundabouts! Sort of defeats the entire purpose.
NJ has eliminated most Traffic Circles. A TC is much, much larger than a roundabout and has much more traffic. NJ is actually installing roundabouts, e.g., one four miles from my house and another ten. Both are working well.