May I introduce you to this big, high speed roundabout with lanes entering the roundabout from the inside of it.
The way the lanes are angled means that you can barely see if someone is coming from your left, and that is causing huge congestion on the north/south freeway crossing under it. Crashes are of course rather frequent due to the poor visibility, too.
Oh yeah, and you are forced to turn right if you dare stay on the rightmost lane. I think it's the only roundabout in my country with an "inner oncoming lanes" design like that.
It is, however, scheduled to be dismantled and rebuilt soon, replaced by like 4 smaller roundabouts instead.