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Crash reductions following installation of roundabouts in the United States
2001 (English)Report (Other (popular science, discussion, etc.))
Abstract [sv]

Modern roundabouts are designed to control traffic flow at intersections

without the use of stop signs or traffic signals. U.S. experience with modern

roundabouts is rather limited to date, but in recent years there has been

growing interest in their potential benefits and a relatively large increase

in roundabout construction. The present study evaluated changes in motor

vehicle crashes following conversion of 24 intersections from stop sign and

traffic signal control to modern roundabouts. The settings, located in 8

states, were a mix of urban, suburban, and rural environments. A before-after

study was conducted using the empirical Bayes approach, which accounts for

regression to the mean. Overall, the empirical Bayes procedure estimated

highly significant reductions of 38 percent for all crash severity's combined

and 76 percent for all injury crashes. Reductions in the numbers of fatal and

incapacitating injury crashes were estimated to be about 90 percent. Overall,

results are consistent with numerous international studies and suggest that

roundabout installation should be strongly promoted as an effective safety

treatment for intersections in the U.S.

Place, publisher, year, edition, pages
Statens väg- och transportforskningsinstitut., VTI konferens , 2001.
Series
VTI konferens, ISSN 1104-7267
Keyword [en]
English, Sweden, Conference, South Africa, Roundabout, Accident rate, Before and after study, Statistics, Analysis, Regression analysis, Mean, Injury, USA
Research subject
Road: Traffic safety and accidents, Road: Junctions and traffic safety
Identifiers
URN: urn:nbn:se:vti:diva-4951OAI: oai:DiVA.org:vti-4951DiVA: diva2:673780
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2013-12-03

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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf