The modern roundabout is characterized by the following basic principles:
- Generally circular shape with counterclockwise traffic flow
- Yield-at-Entry – Vehicles approaching the roundabout must wait for a gap in the circulating flow, or yield, before entering the circle
- Slow speed environment – Through geometric curvature and deflection, the traffic is directed or channeled to the right with a curved entry path into the circulatory roadway
- It can be more than one circulating lane
- In some cases, right turns can bypass the circulating roadway
- Safely accommodates cyclists and pedestrians by providing a low-speed environment