From the Insurance Institute for Highway Safety: http://www.iihs.org/research/topics/roundabouts.html http://www.iihs.org/research/topics/roundabouts.html This

From the Insurance Institute for Highway Safety: http://www.iihs.org/research/topics/roundabouts.html http://www.iihs.org/research/topics/roundabouts.html This study* found: 39% overall decrease in crashes and a 76% decrease in injury-producing crashes. Collisions involving fatal or incapacitating injuries fell as much as 90%. * http://www.iihs.org/sr/pdfs/sr3505.pdf http://www.iihs.org/sr/pdfs/sr3505.pdf