A 3D semi circle
a sphere?
circumference
A piece of an edge of a circle is called an ARC.
The half of a diameter of a circle is known as a radius.
A traffic circle is un rond-point.
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!
We call it a "semi-circle"
The Circle is the Interstate Highway intersection of 90, 94, and 290 which is a major traffic bottleneck.
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.
Either call the last company in which you attended traffic school or call the court.