Where: On any public road.
Purpose: To warn that there is a traffic circle ahead where you may need to yield to other traffic.
Action: Slow down so that you can stop or drive around the circle at a safe speed. Look out for road traffic signs and markings which will tell you whether you have the right of way or whether you have to yield. If there is no indication you have to give way to traffic approaching from the right as they have the right of way. Vehicles within a traffic circle also have right of way.
If you have right of way still look out for traffic in the circle which may not yield to you.