Safety at Two-Lane Roundabouts Improves Over Time, New Study Shows

Roundabouts are a traffic calming device used to improve safety over traditional intersections, however, the safety of two-lane roundabouts is less well-known. This article reports on a study of the safety of two-lane roundabouts, potentially a more complex strategy to manage traffic intersections. Researchers from the Insurance Institute for Highway Safety (IIHS) investigated how crash trends at both single-lane (n = 98) and two-lane (n = 29) roundabouts change over time, with an eye to including driver familiarity as a variable. The study was conducted in Washington State, which has more than 300 roundabouts. The number of crashes at two-lane roundabouts decreased on average 9% per year, with more serious crashes decreasing by nearly 35% annually. The odds of a crash caused by failure to yield right-of-way fell 11% annually at the two-lane roundabouts. The authors conclude with a brief discussion of strategies to increase roundabout safety, regardless of driver experience, by better design and better signage (including pavement markings). Readers are advised to email for a copy of the full report.


  • English

Media Info

  • Media Type: Web
  • Features: Photos;
  • Pagination: pp 4-5
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01714536
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 23 2019 2:16PM