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.
Equation 6-3 on page 6-58 incorrectly contains an addition sign (+) as an operator. The correct operator should be a subtraction sign (-).
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.
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.
|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|
|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|
The Chapter Skim search tool presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter. You may select key terms to highlight them within pages of each chapter.