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I'm a huge roundabout advocate but the user you replied to is correct. Despite the Carmel roundabout looking safer, when you're there, you don't feel like pedestrians are considered. I've driven through them.

Smaller roundabouts in narrower streets feel safer for pedestrians even if the islands are smaller. It's really the street size that is doing the work and the smaller roundabout works in conjunction with the street size to make cars behave more like they're in a turn and not a road with curves in it.