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TRB’s National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide – Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts.

This report updates the U.S. Federal Highway Administration’s Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.

Errata

Equation 6-3 on page 6-58 incorrectly contains an addition sign (+) as an operator. The correct operator should be a subtraction sign (-).

Errata #2

Exhibit 5-23 on page 5-29 of NCHRP Report 672 contains an incorrect calculation of estimated injury crashes.

There is a summary document, Paths to Practice, available.

Topics

Suggested Citation

National Academies of Sciences, Engineering, and Medicine. 2010. Roundabouts: An Informational Guide – Second Edition. Washington, DC: The National Academies Press. https://doi.org/10.17226/22914.

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Publication Info

396 pages |  8.5 x 11 |  DOI: https://doi.org/10.17226/22914
Chapters skim
Front Matter i-xi
Chapter 1 - Introduction 1-19
Chapter 2 - Roundabout Considerations 20-42
Chapter 3 - Planning 43-88
Chapter 4 - Operational Analysis 89-108
Chapter 5 - Safety 109-143
Chapter 6 - Geometric Design 144-246
Chapter 7 - Application of Traffic Control Devices 247-288
Chapter 8 - Illumination 289-299
Chapter 9 - Landscaping 300-314
Chapter 10 - Construction and Maintenance 315-330
Glossary 331-341
Bibliography 342-362
Appendix A - Example Pavement Marking Designs for Roundabouts 363-379
Appendix B - User Education 380-385
Appendix C - Rules of the Road 386-390
Appendix D - Design Supplemental Materials 391-393

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