THE BEGINNINGS OF THE ROUNDABOUT

Abstract

Modern roundabouts have become a subject of great interest and attention over the last few years on all the world. This interest is partially based on the great success of roundabouts in Europe and Australia, where intersection design practice has changed substantially as the result of the good performance of roundabouts and their acceptance by the public. Modern roundabouts follow design principles that are different from those of traffic circles built on the world in the first half of the century. The old circles often gave priority to entering traffic and were designed with the weaving movement as a prime consideration. The circles became fairly large, with long distances between consecutive entrances and exits and with relatively high speeds. In contrast, the modern roundabouts are designed for lower speeds, and its dimensions are determined by the number of branches, required capacity, and by the turning radii of larger vehicles. Deflection of the vehicle path through the roundabout is a critical design element affecting the safety of the roundabout. Entering traffic has to yield to circulating traffic. At low traffic loads, vehicles enter without stopping, at higher loads, entering traffic hasn’t wait for a gap in the circulating stream. To increase roundabout capacity, entries are flared to provide more than one entry lane, and the circulatory roadway is widened.

Authors and Affiliations

Elżbieta MACIOSZEK

Keywords

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  • EP ID EP106039
  • DOI -
  • Views 46
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How To Cite

Elżbieta MACIOSZEK (2009). THE BEGINNINGS OF THE ROUNDABOUT. Scientific Journals of Silesian University of Technology. Series Transport, 2009(65), 57-63. https://europub.co.uk/articles/-A-106039