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Final report to the State DOT Northrhine-Westphalia, Ruhr-University BochumĬandappa N, Logan D, Van Nes N, Corben B (2015) An exploration of alternative intersection designs in the context of safe system. Paper presented at the 3rd international TRB-roundabout conference, Indianapolis, USAīrilon W, Bondzio L (1999) Untersuchung von Mini-Kreisverkehrsplatzen. In: Proceedings of the Transportation Research Board international conference on roundabouts, Vailīrilon W (2011) Studies on roundabouts in Germany: lessons learned. Department for Transport, UKīrilon W (2005) Roundabouts: a state of the art in Germany. Association for European Transport and Contributorsīodé C, Maunsell F (2007) TD 54/07 design of mini-roundabouts. Transportation Research Laboratory, Crowthorne, UKīodé C, Maunsell F (2006) Mini-roundabouts: enabling good practice. Sydneyīinning JC (2000) Assessment of roundabout capacity and delay ARCADY 5 used guide. Mini-roundabout characteristics and geometryĪustroads (2013) Improving the performance of safe system infrastructure: stage 1.This document would aim to make an organic contribution to the knowledge improvement and practical planning and design of mini roundabouts. As always, it is clear that it is not enough to have good guidelines if you do not have the right knowledge to apply them. Today, any designer has at his disposal and help the guidelines of many countries in the world report, in a more or less in-depth way, the design standards of the mini roundabouts. High attention should also paid to requirements due to the limited tolerances imposed by geometry. The mini roundabout design must take into account the above requirements since planning operation through feasibility checks of basic warrants. Therefore, a mini roundabout is better suitable and more efficient in an urban area, especially in a residential one, when some basic condition are matched: low traffic volumes and speeds, single lane converging roads, reduced intersection surface, few heavy vehicles, i.e. Frequently, mini roundabouts might be applied to instances also well suited to be coped with single lane roundabouts, even if they differ from these last, both for lower construction costs, and lesser need of road surface. From a general point of view, the advantages attained by a mini roundabout can be summarized in the road safety upgrade by lowering of vehicle speeds, the reduction of delays and queues, the road space general improvement and a better perception of intersection in the environment. Nevertheless, mini roundabouts play an important role in traffic network design because the number of intersections is much higher in any urban area than in a rural one. This is essentially due to their reduced geometric characteristics, and for this reason they are more effective where traffic flows have lower speeds and volumes. The field of application of the mini roundabouts is not very wide, usually it is restricted to the urban area. Moreover, the inner central island of a mini roundabout is often surmountable or semi-surmountable by heavy vehicles engaged in left turning maneuvers. As their name states, they have smaller geometric features than single lane standards roundabouts. Mini-roundabouts belong to a specific class of the so-called modern roundabouts.
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