How does the design compensate for large vehicles such as semi-trucks?

Incorporated into the design of roundabouts is something called a truck apron. The truck apron is the area between the central island and the roadway that is mountable by larger vehicles but not used by passenger vehicles. Typically this area is concrete versus the roadway which is asphalt.

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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?