Design of modern roundabouts in urban traffic systems

This paper makes an overview on modern roundabout design and practice. Modern roundabout have become an issue of great interest over the last decade in Italy. This fact is partially drawn on the great success of roundabout traffic solutions in some European Countries, where intersections design practice has changed in consequence of the performances gained with roundabouts and their general good acceptance by drivers. Modern roundabouts can have significant impacts and benefits in terms of circulation safety, delays and capacity. These quoted items form as many sections of the paper