Problem is usually turning left from the right lane. Trying to change lanes in the circle is another problem. Additional signage might help, particularly for people who are "new" to them.
We had them all over in the county north of Indianapolis. At least these here are virtually the same. In Indy, they varied in diameter and number of lanes, never more than two. They also would stack them back to back in limited access interchanges. In every case, when traffic volume is low, there were no problems. As traffic increased, even the largest would back up for long distances. In that case, they are better than a stop sign, but not as good as a light.
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