Transportation Research Board. 2022. Highway Capacity Manual 7th Edition: A Guide for Multimodal Mobility Analysis. Reproduced with permission from the National Academy of Sciences, Courtesy of the National Academies Press, Washington, D.C.

Transportation Research Board. 2010, Roundabouts: An Informational Guide, 2nd Edition: NCHRP Report 672. Reproduced with permission from the National Academy of Sciences, Courtesy of the National Academies Press, Washington, D.C.

Transportation Research Board. 2023, Guide for Roundabouts: NCHRP Report 1043. Reproduced with permission from the National Academy of Sciences, Courtesy of the National Academies Press, Washington, D.C.

Virginia Department of Transportation’s Alternative Intersections from