Abstract
The many advantages offered by roundabouts especially in terms of safety, have lead designers to increase this type of cross-roads layout in urban and semi-urban environments. Some roundabouts are built forgetting that another type of cross-roads could sometimes represent an answer better suited to the site in question. The purpose of this guide is thus to summarise the advantages and limitations that a roundabout can present in terms of traffic, safety and fitting into the urban environment. Designers will also find a list of the criteria that should be used in the choice of this type of cross-roads. The geometrical characteristics of roundabouts are not dealt with in the guide. (A)