How are roundabouts safer?

Roundabouts are designed to be safer and more efficient than a traditional intersection.  The design of the roundabout creates a low speed (20 to 30 miles per hour) environment and prevents high-angle crashes such as “T-bone” crashes.  Low-angle, low-speed crashes tend to be less severe than higher-angle, high-speed crashes.

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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?