Sounds like a roundabout, where some roads meet and you have to drive round the middle... Do you know what a Polo Mint looks like?
A 3D semi circle
When exiting a traffic circle, you should signal your intention to leave by using your turn signal well in advance of your exit. Check your mirrors and blind spots for pedestrians, cyclists, and other vehicles before you move to the exit lane. Maintain a safe speed while navigating the circle, and yield to any traffic already in the circle if necessary. Once you've safely exited, deactivate your turn signal.
circumference
a sphere?
A piece of an edge of a circle is called an ARC.
A traffic circle is un rond-point.
We call it a "semi-circle"
Follow the road laws of the country that you are in. In some countries the traffic already in the circle has priority. In others, traffic entering the circle has priority. Very clearly a recipe for disaster if you forget which country with which rules you are in!
The Circle is the Interstate Highway intersection of 90, 94, and 290 which is a major traffic bottleneck.
A black circle traffic sign indicates a mandatory action or instruction that must be followed by drivers.
A semi-circle
Concentric Circles?
We call it a circle.
Traffic accident! call 911 or somebody who can help!
traffic trigger
A circle with three dimensions is sphere.
The British call a flashlight a torch.