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Crash patterns and potential engineering countermeasures at Maryland roundabouts.

Srinivas Mandavilli1, Anne T McCartt, Richard A Retting

  • 1Insurance Institute for Highway Safety, Arlington, Virginia 22201, USA. smandavilli@iihs.org

Traffic Injury Prevention
|February 14, 2009
PubMed
Summary

Roundabouts reduce intersection crashes, but high speeds and poor visibility cause remaining accidents. Enhancing signage and design can improve roundabout safety for drivers.

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Area of Science:

  • Traffic Safety
  • Roadway Engineering
  • Accident Analysis

Background:

  • Motor vehicle crashes at intersections cause over 1.2 million injuries and 9,000 deaths annually in the U.S.
  • Roundabouts have demonstrated effectiveness in reducing crash frequency and severity compared to traditional intersections.
  • Despite safety benefits, crashes still occur at roundabouts, necessitating further investigation.

Purpose of the Study:

  • To systematically review police crash reports for roundabouts in Maryland.
  • To develop a typology of roundabout crashes.
  • To identify potential countermeasures for reducing roundabout crashes.

Main Methods:

  • Reviewed 283 police crash reports from single-lane and double-lane roundabouts.
  • Developed crash typologies based on roundabout type, crash location, and other variables.
  • Conducted field observations at high-crash-history roundabouts to identify countermeasures.

Main Results:

  • Approximately 75% of crashes resulted in property damage only.
  • Common crash types included central island collisions, rear-end, and sideswipe incidents.
  • High approach speeds and inadequate driver awareness of roundabouts were identified as key contributing factors, with most crashes occurring at entrances.

Conclusions:

  • Increasing roundabout conspicuity with larger signs and reflective markers can alert drivers and reduce speeds.
  • Enhanced landscaping and yield signs at entrances can improve driver recognition and yielding behavior.
  • Design features like entry deflection may also contribute to speed reduction and enhanced safety.