traf·fic cir·cle
noun/ˈtræfɪk sɜːkl/
/ˈtræfɪk sɜːrkl/
(also rotary)
(both North American English) (British English roundabout)
- a place where two or more roads meet, forming a circle that all traffic must go around in the same direction
（交通）环岛