An intersection is a location where roads and traffic flows cross one another or split and where road users may change direction. Intersections come in different shapes and sizes, but are characterised by the fact that road users cross one another at the same level. A roundabout is an at-grade intersection at which traffic flows in a circular movement and where traffic already on the roundabout has right of way [1]. A comprehensive description of different intersection types can be found at the section What are the different types of intersection? An intersection differs from a crossing. At a level crossing different traffic flows meet, but road users may not change direction. Examples are railway crossings or pedestrian and bicycle crossings. At split-level crossings, road users do not meet.
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