Roundabout? Are you referring to a Traffic Circle?
“Another problem is that the word roundabout brings up for many people an image of an old “traffic circle” or, in the Northeast, a “rotary” intersection. But these are not necessarily roundabouts, just as the Arc de Triomphe is not a roundabout, nor is New York City’s Columbus Circle (which, for the record, is acknowledged as the world’s first “rotary system” intersection).
The two are fundamentally different beasts. You are in a modern roundabout if it is the entering driver who must yield to traffic already circling. You are NOT in a modern roundabout if you are expected to yield to entering drivers or if you encounter traffic lights or stop signs.”