Evaluation of Current Practice for Illumination at Roundabouts: Safety and Illumination of Roundabouts (Phase I)

This report is for the first phase of a two-phase research program to develop recommended practices for Georgia Department of Transportation (GDOT) for lighting rural roundabouts. Phase I of the study was designed to improve understanding of the relationship between roundabout illumination and safety, particularly in rural areas. Such information is essential to developing a sound basis for determining if a rural roundabout should, or should not, be illuminated to the current Illuminating Engineering Society (IES) standard and, if not, whether safety objectives can be met with either unlit roundabouts or roundabouts illuminated at reduced levels. The report provides a summary of relevant literature; international practices for rural roundabout illumination, a safety analysis of nighttime roundabout crashes using data from Minnesota and Georgia and provides preliminary results regarding the cost effectiveness of unlit or partially lit roundabouts as rural safety treatments.

  • Record URL:
  • Record URL:
  • Supplemental Notes:
    • Report Date: March 2014; Revised July 2015, March 2016.
  • Corporate Authors:

    Georgia Institute of Technology, Atlanta

    School of Civil and Environmental Engineering
    Atlanta, GA  United States  30332

    Georgia Department of Transportation

    Office of Research, 15 Kennedy Drive
    Forest Park, GA  United States  30297-2534

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Rodgers, Michael O
    • Hunter, Michael
    • Samoylov, Alexander
    • Gbologah, Franklin
    • Berrebi, Simon J
  • Publication Date: 2016-3


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 65p

Subject/Index Terms

Filing Info

  • Accession Number: 01596841
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-GA-15-12-01, RP 12-01, Project No. 2006T40
  • Contract Numbers: 0010499
  • Created Date: Mar 29 2016 9:36AM