In the UK I have seen 3 way roundaboutsIn the highway code see rule 190 for two threeway roundabouts stuck together. <a href="https://highwaycode.org.uk/roundabouts/" rel="nofollow">https://highwaycode.org.uk/roundabouts/Wikipedia shows a few e.g.<a href="https://commons.wikimedia.org/wiki/File:Germany,_Sachsen-Anhalt,_S%C3%BCdharz,_Uftrungen_(1).JPG" rel="nofollow">https://commons.wikimedia.org/wiki/File:Germany,_Sachsen-Anh...<a href="https://commons.wikimedia.org/wiki/File:Waterloo,_Ontario,_mini-roundabout_at_Union_Street_East_and_Margaret_Avenue_South.jpg" rel="nofollow">https://commons.wikimedia.org/wiki/File:Waterloo,_Ontario,_m...
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pasc1878 · · focus · HN ↗
In the highway code see rule 190 for two threeway roundabouts stuck together. <a href="https://highwaycode.org.uk/roundabouts/" rel="nofollow">https://highwaycode.org.uk/roundabouts/
Wikipedia shows a few e.g.
<a href="https://commons.wikimedia.org/wiki/File:Germany,_Sachsen-Anhalt,_S%C3%BCdharz,_Uftrungen_(1).JPG" rel="nofollow">https://commons.wikimedia.org/wiki/File:Germany,_Sachsen-Anh...
<a href="https://commons.wikimedia.org/wiki/File:Waterloo,_Ontario,_mini-roundabout_at_Union_Street_East_and_Margaret_Avenue_South.jpg" rel="nofollow">https://commons.wikimedia.org/wiki/File:Waterloo,_Ontario,_m...