Special Types of Circular Intersections
Large roundabouts such as those used at motorway junctions typically have two to six lanes around the central hub, and may have traffic lights regulating flow. They can not function as efficiently as a modern roundabout.
Some roundabouts have a divider between traffic turning from one road onto an adjacent one, and traffic within the roundabout, enabling those making such turns to bypass the roundabout entirely. Some call these slip lanes.
Read more about this topic: Roundabout
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—Henry David Thoreau (1817–1862)