On a recent visit to Sarasota, Florida, I discovered multiple traffic circles on a major roadway (US-41):

I was not there at the busiest time of the day but it seemed that all the traffic was flowing fine through the roundabout. The biggest issue I could imagine for drivers is getting into the correct lane for where the driver wants to exit the traffic circle. For example, in the image above, to go straight, the driver could be in either lane but to go left or right, one has to pick the correct lane and then exit appropriately.

These were not the only traffic circles spotted in western Florida. I saw several under construction, both on existing roadways and along new roadways. The more constructed, the more familiar drivers will be with them.

One big advantage of these is that traffic can often keep moving rather than the stopping required by stop signs or traffic lights. If the driver has yielded, there is no need to stop if the coast is clear.

I do not know which American communities have more traffic circles than others but this could be an interesting way for places to distinguish themselves from others.