Alternative types of roundabouts at development phases

Abstract

As pointed-out previously, today after many years of experience regarding roundabouts, there are different ideas about the ‘‘ideal roundabout’’. Therefore the development of design rules and advice from an extensive body of research should allow civil and traffic engineers to produce more effective forms of this junction type. It also needs to be stressed that the roundabout has been ‘‘at the development phase’’ since 1902, this development is still in progress, and one of the results of this progress is that several types of roundabouts are in worldwide usage today, called the “alternative types of roundabouts”. Some of them are already in frequent use all over the world, some of them are recent and have only been implemented within certain countries, and some of them are still at development phases. It is because of that we can call them “theoretical roundabouts”.