How much safer are roundabouts?

According to the U.S. Department of Transportation (USDOT) Federal Highway Administration, roundabouts reduce the types of crashes where people are seriously hurt or killed by 78 to 82% when compared to conventional stop-controlled and signalized intersections, per the AASHTO Highway Safety Manual.

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1. How are roundabouts safer?
2. Are roundabouts really more efficient?
3. How does the design compensate for large vehicles such as semi-trucks?
4. How much safer are roundabouts?