Mythbusters did a test of roundabouts vs fourway intersections (no lights), many years ago. Their conclusion i believe was they were about the same in pretty m

Mythbusters did a test of roundabouts vs fourway intersections (no lights), many years ago. Their conclusion i believe was they were about the same in pretty much all regards. It was highly synthetic, people driving around a small course with roundabouts or fourway intersections, continuously for an hour or something.