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...WTF.

The Wikipedia article doesn't even give any explanation as to why.

Why on earth did they build a circle of six roundabouts, rather than simply a single roundabout with six entrances/exits?

I'm baffled.

You don't have to do a full loop if you need an adjacent exit. Eases load on the rest of entrances.

Ah, that makes sense. Thank you!

There was a big roundabout, but it couldn't handle the traffic volume.