Modern roundabouts are the safest form of intersection in the world (much more so than comparable signals). Visit
Highway safety topics for modern roundabout FAQs and safety facts. Modern roundabouts, and the pedestrian refuge islands approaching them, are two of nine proven safety measures identified by the FHWA,
Proven Safety Countermeasures - Safety | Federal Highway Administration
The FHWA has a video about modern roundabouts on Youtube, or check out the IIHS video (iihs dot org).
http://priceonomics.com/the-case-for...c-roundabouts/
Here’s a quote:
“By 2025, a quarter of all drivers in the United States will be over the age of 65. Intersections are the single most dangerous traffic environment for drivers of any age with left-hand turns being the single most dangerous traffic maneuver that any of us can make. Forty percent of all crashes that involve drivers over the age of 65 occur at intersections. This is nearly twice the rate of experienced younger drivers. AARP would like to see more roundabouts constructed because of the many safety benefits that they present for drivers of all ages.” - Jana Lynott, AARP Public Policy Institute