Roundabout

A roundabout (also known as a traffic island) is a road circle joining three or more roads. Drivers follow a simple rule to avoid crashes. 
In countries that drive on the left:
The driver goes round the island in a "clockwise" direction.
In countries that drive on the right:
The driver goes round the island in an "anticlockwise" direction.
Types of circular intersections.
There are larger roundabouts that can have two to six lanes and can have traffic lights. These can sometimes be found at motorway junctions.
Gyratory system.
The term "gyratory" (for example, Hanger Lane gyratory) is sometimes used in the United Kingdom for a larger roundabout with unusual features.