Flush intersections, where possible, must be made with roundabouts. This solution does not reduce the capabilities of the intersection and, at the same time, increases safety. Roundabouts have positive effects on both the reduction of vehicle speed and safety with a reduction in road accidents.
Techniques for the construction and evaluation of roundabout intersections
The second generation roundabouts.
Some elements of the manuals of the Piedmont region and the Lombardy region.
Notes on French, Dutch, German and Swiss legislation (pdf)
Giulio Maternini - Full Professor of the University of Brescia