A roadway
intersection where the roads don't directly cross (like at a
stoplight) but enter/exit on a circular road. When well designed it is very superior to a normal intersection, but prone to confuse people who learned to drive in a place without them. Poorly designed or outdated they are a
recipe for disaster.
If you live in New Jersey, but don't know what a
traffic circle is, you're living an unbelievably
sheltered life.
When correctly designed, you should always
yield when entering the circle, but never when in the circle.