The official distinction between roundabout and rotary is that rotary is big, roundabout is small, and that roundabout is empirically? better. But the ultimate in roundabouts, if you keep shrinking, is a blind intersection, and that is not so good, so size can't be the whole story. Rotary seems to me better, since the increased circumference gives you more space for merging in.
One surprising statement in the article was that signal lights were 'deemed' cheaper. How can that be - after all it's just a round road with dirt in middle - unless part of already-built-up neighboring property is needed for roundabout. Note to NC (county? city?) officials- not all of the GF/R/Z/NCH intersection is built up yet, act now please.
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