Synthesis of Information Related to Highway Problems. Topic 46-02. Roundabout Design, Operations, and Safety Practices

The use of modern roundabouts as an alternative for intersection control has increased dramatically in recent years across the United States. National Cooperative Highway Research Program (NCHRP) Report 672, Roundabouts: An Informational Guide, Second Edition, is an authoritative, but not prescriptive, guide on roundabout design. State and municipal roadway agencies are free to use a range of sources and engineering judgment to establish their policies and design guidelines for roundabouts. The purpose of this synthesis is to document and summarize the current roundabout policies, guidance, and practices within state departments of transportation (DOTs). The primary focus will be on roundabout selection and design with a secondary focus on performance. The synthesis will be a useful reference to agencies that are creating or updating roundabout and intersection control policies.


  • English


  • Status: Active
  • Contract Numbers:

    Project 20-05, Topic

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program (NCHRP) Synthesis

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC    20001
  • Project Managers:

    Gause, Jo

  • Performing Organizations:

    Kittelson & Associates, Inc.

  • Principal Investigators:

    Pochowski, Alex

  • Start Date: 20140901
  • Expected Completion Date: 0
  • Actual Completion Date: 0
  • Source Data: RiP Project 37615

Subject/Index Terms

Filing Info

  • Accession Number: 01543389
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-05, Topic
  • Files: TRB, RiP
  • Created Date: Nov 14 2014 1:00AM