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.
Table of Contents
|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|
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