Accelerating Roundabout Implementation in the United States Volume 7: Human Factor Assessment of Traffic Control Device Effectiveness

This volume is seventh in a series of seven. The other volumes in the series are: Volume I - Evaluation of Rectangular Rapid-Flashing Beacons (RRFB) at Multilane Roundabouts, Volume II – Assessment of Roundabout Capacity Models for the Highway Capacity Manual, Volume III – Assessment of the Environmental Characteristics of Roundabouts, Volume IV – A Review of Fatal and Severe Injury Crashes at Roundabouts, Volume V – Evaluation of Geometric Parameters that Affect Truck Maneuvering and Stability, and Volume VI – Investigation of Crosswalk Design and Driver Behaviors. These reports document a Federal Highway Administration (FHWA) project to investigate and evaluate several important aspects of roundabout design and operation for the purpose of providing practitioners with better information, leading to more widespread and routine implementation of higher quality roundabouts. This report examined the relationship between signing and marking of multilane roundabouts and the likelihood of erratic maneuvers, and thus conflicts and crashes. The report documents two different studies: (1) observation of erratic maneuvers and conflicts from overhead video recordings; and (2) an in-vehicle eye tracker study to investigate driver gaze patterns and gaze direction while traversing multilane roundabouts. The two most dominant contributing factors to erratic maneuvers appear to be (1) inconsistencies between lane use markings on the approach and those within the circulatory roadway, and (2) insufficient channelization for drivers when being shifted from the inside lane to the outside lane to exit. Drivers also were more likely to glance at markings than at signs.

  • Record URL:
  • Supplemental Notes:
    • Alternate title: Accelerating Roundabout Implementation in the United States: Volume VII of VII - Human Factor Assessment of Traffic Control Device Effectiveness.
  • Corporate Authors:

    North Carolina State University, Raleigh

    Institute for Transportation Research and Education
    Centennial Campus Box 8601
    Raleigh, NC  United States  27695-8601

    Virginia Polytechnic Institute and State University, Blacksburg

    Virginia Tech Transportation Institute
    3500 Transportation Research Plaza
    Blacksburg, VA  United States  24061

    Kittelson and Associates, Incorporated

    610 SW Alder Street, Suite 700
    Portland, OR  United States  97205

    Federal Highway Administration

    Office of Safety, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Findley, Daniel
    • Searcy, Sarah
    • Salamati, Katy
    • Schroeder, Bastian
    • Williams, Brian
    • Bhagavathula, Rajaram
    • Rodegerdts, Lee A
  • Publication Date: 2015-9


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Technical Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 100p

Subject/Index Terms

Filing Info

  • Accession Number: 01741944
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-SA-15-075, Report No. 11861 Task 9
  • Contract Numbers: DTFH61-10-D-00023-T-11002
  • Created Date: Jun 4 2020 2:42PM