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A roundabout is a circular intersection similar to the traffic circle used previously in this country. The major differences between a traffic circle and a roundabout are:

• Yield at Entry
  At roundabouts, the entering traffic yields the right of way to the circulating traffic. This yield-at-entry rule keeps traffic from locking up and allows free flow movement.
• Deflection
  The entry and center island of a roundabout enables entering traffic to slow down which reinforces the yielding process.
• Flare
  The entry to a roundabout often flares out from one or two lanes to two or three lanes at the yield line to provide increased capacity.