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AGRD04B-15_Guide_to_Road_Design_Part_4B_Roundabouts_Ed3.1.pdf
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Guide to Road Design Part 4B:
Roundabouts
Sydney 2021
Guide to Road Design Part 4B: Roundabouts
Edition 3.1 prepared by: Peter Aumann
Publisher
Austroads Ltd.
Level 9, 287 Elizabeth Street
Sydney NSW 2000 Australia
Phone: +61 2 8265 3300
austroads@austroads.com.au
www.austroads.com.au
Edition 3.1 project manager: Mike Whitehead
Abstract
The Guide to Road Design Part 4B: Roundabouts
provides road designers and other practitioners with
guidance on the geometric design of roundabouts. It
covers design principles and procedures, and
guidelines for all the key elements, thus enabling
practitioners to develop safe and efficient layouts.
Part 4B also provides information on pedestrian and
cyclist treatment at roundabouts and related topics
such as pavement markings, signs and landscaping.
However, designers should refer to other relevant
parts of the Guide to Road Design and to the Guide to
Traffic Management Part 6: Intersections,
Interchanges and Crossings (Austroads 2013a) that
cover traffic management and road use aspects of
roundabouts and criteria for the appropriate selection
and design of intersections.
It will be necessary for designers to refer to other
parts of the Guide to Road Design for guidance on
general criteria and information that are common to
all at-grade intersections, in particular: Part 4:
Intersections and Crossings – General (Austroads
2009a) and Part 4A: Unsignalised and Signalised
Intersections (Austroads 2010a).
About Austroads
Austroads is the peak organisation of Australasian road transport and traffic
agencies.
Austroads’ purpose is to support our member organisations to deliver an
improved Australasian road transport network. To succeed in this task, we
undertake leading-edge road and transport research which underpins our
input to policy development and published guidance on the design,
construction and management of the road network and its associated
infrastructure.
Austroads provides a collective approach that delivers value for money,
encourages shared knowledge and drives consistency for road users.
Austroads is governed by a Board consisting of senior executive
representatives from each of its eleven member organisations:
• Transport for NSW
• Department of Transport Victoria
• Queensland Department of Transport and Main Roads
• Main Roads Western Australia
• Department for Infrastructure and Transport South Australia
• Department of State Growth Tasmania
• Department of Infrastructure, Planning and Logistics Northern Territory
• Transport Canberra and City Services Directorate, Australian Capital
Territory
• Department of Infrastructure, Transport, Regional Development and
Communications
• Australian Local Government Association
• New Zealand Transport Agency.
Keywords
Design principles, design procedure, sight distance,
geometric design, central island, entry geometry,
circulating carriageway, superelevation, gradient,
central island radius, pedestrians, cyclists, bicycle
lanes, bicycle paths, shared paths, landscaping.
ISBN 978-1-922382-17-7
Austroads Project No. SRD6219
Austroads Publication No. AGRD04B-15
Pages 89
Edition 3.1 published February 2021
Edition 3.1 replaces figure 1.1 and contains technical changes and minor editorial changes to Sections 1.6, 2.2, 4.1, 4.4, 4.5 and 5.3.
Edition 3.0 contains technical changes and minor editorial changes to Sections 1.3, 1.6, 1.9, 4.3, 4.4, 4.5, 4.7, 4.9, 5.3, 6.3, and 7
and the addition of information relating to the extended design domain for vehicle entry path radii. Updates have been made
throughout this edition to include new and updated reference material and cross-references added to other Guides.
Edition 3.0 published December 2015
Edition 2.0 published January 2011
Edition 1.0 published August 2009
© Austroads Ltd 2021 | This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be
reproduced by any process without the prior written permission of Austroads.
This Guide is produced by Austroads as a general guide only. Austroads has taken care to ensure that this publication is correct at
the time of publication. Austroads does not make any representations or warrant that the Guide is free from error, is current, or,
where used, will ensure compliance with any legislative, regulatory or general law requirements. Austroads expressly disclaims all
and any guarantees, undertakings and warranties, expressed or implied, and is not liable, including for negligence, for any loss
(incidental or consequential), injury, damage or any other consequences arising directly or indirectly from the use of this Guide.
Where third party information is contained in this Guide, it is included with the consent of the third party and in good faith. It does not
necessarily reflect the considered views of Austroads Readers should rely on their own skill, care and judgement to apply the
information contained in this Guide and seek professional advice regarding their particular issues.
Acknowledgements
The authors acknowledge the role and contribution of the Austroads Road Design Task Force in providing guidance and information
during the preparation of this Guide. The panel comprised the following members:
Mr Peter Ellis Roads and Maritime Services New South Wales
Mr Richard Fanning Roads Corporation Victoria
Mr Mike Whitehead Department of Transport and Main Roads, Queensland (Project Manager)
Mr Albert Wong Main Roads Western Australia
Mr Noel O’Callaghan Department of Planning, Transport and Infrastructure South Australia
Mr William Moodie Department of Transport Northern Territory
Mr Ben McHugh Territory and Municipal Services Directorate, Australian Capital Territory
Mr Tony Napoli Australian Local Government Association
Mr James Hughes NZ Transport Agency
Mr Tom Brock Consult Australia
Ms Gemma Kernich Australian Bicycle Council
Mr Michael Tziotis ARRB Group Ltd.
It is also acknowledged that this third edition has been updated from previous editions prepared by Gary Veith and Owen Arndt.
Guide to Road Design Part 4B: Roundabouts
Austroads 2021 | page i
Contents
1. Introduction ............................................................................................................................................. 1
1.1 Purpose .................................................................................................................................................... 1
1.2 Scope of this Part ..................................................................................................................................... 1
1.3 Road Safety .............................................................................................................................................. 2
1.4 Road Design Objectives ........................................................................................................................... 3
1.5 Traffic Management at Roundabouts ....................................................................................................... 3
1.6 Safety Performance of Roundabouts ....................................................................................................... 3
1.7 Traffic Capacity of Roundabouts .............................................................................................................. 5
1.8 Signalisation of Roundabouts ................................................................................................................... 5
1.9 Roundabouts in High Speed Rural Areas ................................................................................................ 6
2. Design Principles and Procedure ......................................................................................................... 7
2.1 Terminology .............................................................................................................................................. 7
2.2 Design Principles ...................................................................................................................................... 8
2.3 Design Procedure ..................................................................................................................................... 8
3. Sight Distance ....................................................................................................................................... 12
3.1 Introduction ............................................................................................................................................. 12
3.2 Sight Distance Criteria ............................................................................................................................ 12
3.2.1 Criterion 1 ................................................................................................................................. 12
3.2.2 Criterion 2 ................................................................................................................................. 14
3.2.3 Criterion 3 ................................................................................................................................. 15
3.2.4 Other Visibility Considerations.................................................................................................. 15
3.3 Stopping Sight Distance for Trucks ........................................................................................................ 15
4. Geometric Design ................................................................................................................................. 16
4.1 Introduction ............................................................................................................................................. 16
4.2 Number of Legs ...................................................................................................................................... 16
4.3 Number of Entry, Circulating and Exit Lanes ......................................................................................... 16
4.3.1 Introduction ............................................................................................................................... 16
4.3.2 Number of Entry Lanes ............................................................................................................. 17
4.3.3 Number of Circulating Lanes .................................................................................................... 17
4.3.4 Number of Exit Lanes ............................................................................................................... 17
4.3.5 Left-turn Slip Lanes .................................................................................................................. 17
4.3.6 Special Use Lanes .................................................................................................................... 17
4.4 Central Island ......................................................................................................................................... 18
4.4.1 Central Island Shape ................................................................................................................ 18
4.4.2 Factors Affecting Central Island Size ....................................................................................... 19
4.4.3 Central Island Radius ............................................................................................................... 20
4.5 Approach and Entry Geometry ............................................................................................................... 22
4.5.1 General ..................................................................................................................................... 22
4.5.2 Approach and Entry Treatments............................................................................................... 23
4.5.3 Maximum Entry Path Radius .................................................................................................... 27
4.5.4 Splitter Islands .......................................................................................................................... 32
4.6 Circulating Carriageway ......................................................................................................................... 33
4.6.1 Design Vehicle and Vehicle Swept Paths ................................................................................ 33
4.6.2 Width of Circulating Carriageway ............................................................................................. 33
4.6.3 Encroachment Areas ................................................................................................................ 38
4.7 Exit Curves ............................................................................................................................................. 40
4.8 Entry and Exit Widths ............................................................................................................................. 40
4.9 Separation between Legs ....................................................................................................................... 41
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