In a recent Insurance Institute for Highway Safety study of 24 intersections in the USA where stop control and traffic signals were replaced with Modern Roundabouts, there was a large drop in crashes. They have a 90% fatal crash reduction. Roundabouts reduce vehicle speed, minimize vehicle weaving, automatically establish right-of-way, and reduce points of conflict.
For more information about the safety of roundabouts or information about how to navigate a roundabout, click here.
For more information, The Wisconsin Department of Transportation has created videos on roundabout usage. The Insurance Institute for Highway Safety also has a short video as well as other general information.