How is that a thing? Why not just have a two-lane roundabout with the third lane skipping the roundabout and going to the next exit directly?
Imagine a single roundabout with large number of lanes that can go just one way or exit the roundabout, then you can easily have a pile up in one exit block the drivers haded to the other exists. However, if the roundabout can go both directions the drivers can go through the other side of the centre.
They actually work really well.
I'd love to see some of the things that generative ML could do in this space :)
Another advantage of the recursive design over a big roundabout is that it keeps traffic speeds slow, so collisions are much less deadly.