What is a Roundabout?

An intersection which accommodates traffic flow in one direction around a central circular island.  It is used as a form of intersection control, like traffic signals or stop signs.

Why is a roundabout being used at this intersection?

The five-way junction had unusual geometrics and caused conflicting traffic movements.  The roundabout simplified the intersection, giving the driver a smoother transition to entrances and exits.  The one-lane roundabout requires drivers to yield to one-way traffic before entering, then round the loop to the appropriate exit.  If you miss the exit, do not stop!  Simply travel around the circle again and exit on the appropriate road.