Roundabouts: An Informational Guide, Second Edition

Read About the Science Behind Roundabouts

This report by the Transportation Research Board of the National Academies of Sciences, Engineering, and Medicine, addresses the planning, design, construction, maintenance, and operation of roundabouts. It also explains the trade-offs associated with roundabouts.

“Selection and design of a roundabout, as with any intersection treatment, requires the balancing of competing objectives. These range from transportation-oriented objectives like safety, operational performance, and accessibility for all users to other factors such as economics, land use, aesthetics, and environmental aspects.”

Lee A. Rodegerdts, P.E.

This second edition is considered the authoritative guide on roundabouts. The report includes introductory material and general information suitable for the general public. For industry professionals, it also includes planning and design guidance, operational and safety performance evaluation techniques, construction and maintenance information, discussion of the wide range of potential applications of roundabouts, and principles that must be considered when selecting and designing roundabouts.

Click here to download the full 400 page report.