Roundabouts in the United States

Based on a comprehensive evaluation of roundabouts in the United States, this report presents methods of estimating the safety and operational impacts of roundabouts and updates design criteria for them. The report will be useful to geometric designers and traffic engineers who are considering improvements to an intersection.

  • Record URL:
  • Availability:
  • Supplemental Notes:
    • Appendices A through N have been published as NCHRP Web Document 94, available on the TRB website. Also included in this Web document are detailed reviews of the literature on safety performance and operational models, the master inventory of U.S. roundabouts assembled for this project, and the results of the statistical testing of various models.
  • Authors:
    • Rodegerdts, Lee
    • Blogg, Miranda
    • Wemple, Elizabeth
    • Myers, Edward
    • Kyte, Michael
    • Dixon, Michael P
    • List, George F
    • Flannery, Aimee
    • Troutbeck, Rod
    • Brilon, Werner
    • Wu, Ning
    • Persaud, Bhagwant N
    • Lyon, Craig
    • Harkey, David L
    • Carter, Daniel
  • Publication Date: 2007


  • English

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: 123p
  • Serial:
    • NCHRP Report
    • Issue Number: 572
    • Publisher: Transportation Research Board
    • ISSN: 0077-5614
  • Publication flags:

    Open Access (libre)

Subject/Index Terms

Filing Info

  • Accession Number: 01044660
  • Record Type: Publication
  • ISBN: 9780309098748
  • Report/Paper Numbers: Project 3-65
  • Files: TRIS, TRB, ATRI
  • Created Date: Mar 29 2007 10:00AM