Like the Magic Roundabout in the UK? https://www.bbc.co.uk/news/articles/cdx9nlgk97eo
Ours is much simpler, with a round-a-bout on either side of a regional highway. One of the difficult parts about it is everybody is already jacked the fuck up (on account of 2 of the 5 input/outputs being extremely steep grade to enter/exit a river-crossing, with speeds averaging 65-70mph ["55mph" posted, oklol).
That wouldn't raise an eyebrow here in the UK, it's very normal for highway junctions to have on/off ramps that end in 2-3 lane roundabouts, one each side of the highway.