traffic circle
US /ˈtræf.ɪk ˌsɝː.kl̩/
UK /ˈtræf.ɪk ˌsɝː.kl̩/

1.
a circular intersection where traffic flows in one direction around a central island
:
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At the end of the road, you'll see a large traffic circle.
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Drivers must yield to traffic already in the traffic circle.