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I definitely like the idea of this but it seems like the tendency is always the opposite because it's much cheaper to build a pedestrian overpass than a car one, even though they're also an accessibility nightmare and usually kind of a terrible experience and aesthetic blight in their own right.

That's really awesome, but you need a tremendous amount of land to make that possible.

Most roundabouts of that type I know have replaced similarly sized all asphalt intersections. Now there is more green. When planned ahead there really isn’t that much extra real estate required if you are willing to have steeper grades for pedestrians only for example.

Oh wow, years ago I randomly came across that place upon once when I was in Arnhem and was very confused about it, interesting to see it here!