I don't know, those images of cars standing still on the roundabout are not very convincing that this is an efficient way to do it. I'd love to see this compare

I don't know, those images of cars standing still on the roundabout are not very convincing that this is an efficient way to do it. I'd love to see this compared to the more structured Dutch turbo-roundabouts: before you enter the roundabout, you pick the lane for your exit, and you just follow that. You only cross other traffic once, on entering the roundabout. After that, it's smooth sailing to your exit.