As a veteran of roundabouts (we call them “Rotaries” in the People’s Republic of Marxachusetts), I BEG TO DIFFER!!!!!
The problem with roundabouts is they require the common courtesy to yield and give right of way... We do not have that common courtesy in this country. We don’t even stop or give right of way for four way intersections that require us stop and give right of way. For these to work common courtesy is going to have to change drastically first.
Yep, I remember as a teenager in Southbridge, our cruise down Main Street started at the west end of the rotary (called “Felix” because of a statue in the middle of somebody named Felix Gatineau), and went about a mile and a half to the rotary down by the “Hay Ho” (old American Optical Company).