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Promet - Traffic&Transportation journal

Accelerating Discoveries in Traffic Science

Accelerating Discoveries in Traffic Science

PUBLISHED
27.10.2013
LICENSE
Copyright (c) 2024 Tomaž Tollazzi, Goran Jovanović, Marko Renčelj

New Type of Roundabout: Dual One-Lane Roundabouts on Two Levels with Right-Hand Turning Bypasses – ’’Target Roundabout’’

Authors:

Tomaž Tollazzi
University of Maribor, Faculty for Civil Engineering

Goran Jovanović
Appia d.o.o. Leskoškova 9e SI-1000 Ljubljana Slovenija

Marko Renčelj
University of Maribor, Faculty for Civil Engineering

Keywords:roundabouts, alternative types of roundabouts, turbo roundabout, target roundabout

Abstract

The problems of low level traffic safety on multi-lane roundabouts have been resolved in various ways in different countries, usually by using alternative types of roundabouts that reduce the number of conflict points. Alternative types of roundabouts typically differ from 'normal' or 'standard' roundabouts in one or more design elements, as their implementation purposes could also be specific. Today, several different types of roundabouts are already in use ('mini', 'double mini', 'dumb-bell', those 'with joint splitter islands' ('dog-bone'), those 'with a spiralling circular carriageway' ('turbo'), those 'with depressed lanes for right-hand turners' ('flower') etc.). This paper introduces a new type of roundabout, dual one-lane roundabouts on two levels with right-hand turning bypasses, namely the 'target roundabout'. This paper describes and analyses their design, traffic safety, and capacity characteristics, compared with the standard two–lane roundabouts.

References

  1. Brown, M.: The Design of Roundabouts. London: HMSO. 270 p. ISBN 0115517413, 1995.

    Mauro, R.; Branco, F.: Comparative Analysis of Compact Multilane Roundabouts and Turbo-Roundabouts, Journal of Transportation Engineering, Vol. 136, No. 4: 316-322, April 2010. DOI: 10.1061/(ASCE)TE.1943-5436.0000106

    Engelsman, J.C.; Uken, M.: Turbo roundabouts as an alternative to two lane roundabouts, in Proc. of the 26th Southern African Transport Conference (SATC 2007). Ed. by Underwood, G. July 9-12, 2007, Pretoria, South Africa. Produced by: Document Transformation Technologies cc. ISBN Number: 1-920-01702-X

    Fortuijn, L.G.H.: Turbo Roundabouts: Design Principles and Safety Performance, Journal of the Transportation Research Board: 16 – 24. 2009, DOI: 10.3141/2096-03

    Žilionienė, D.; Oginskas, R.; Petkevičius, K.: Research, analysis and evaluation of roundabouts constructed in Lithuania, The Baltic Journal of Road and Bridge Engineering 5(4), 2010: 240-245. DOI: 10.3846/bjrbe.2010.32.

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How to Cite
Tollazzi, T. (et al.) 2013. New Type of Roundabout: Dual One-Lane Roundabouts on Two Levels with Right-Hand Turning Bypasses – ’’Target Roundabout’’. Traffic&Transportation Journal. 25, 5 (Oct. 2013), 475-481. DOI: https://doi.org/10.7307/ptt.v25i5.1230.

SPECIAL ISSUE IS OUT

Guest Editor: Eleonora Papadimitriou, PhD

Editors: Marko Matulin, PhD, Dario Babić, PhD, Marko Ševrović, PhD


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