How do roundabouts differ from older traffic circles and rotaries?
Modern roundabouts are much smaller than older traffic circles and rotaries, and roundabouts require vehicles to negotiate a sharper curve to enter. These differences make travel speeds in roundabouts slower than speeds in traffic circles and rotaries. Because of the higher speeds in older circles and rotaries, many were equipped with traffic signals or stop signs to help reduce potential crashes. In addition, some older traffic circles and rotaries operated according to the traditional "yield-to-the-right" rule, with circulating traffic yielding to entering traffic.

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1. What is a roundabout?
2. How do roundabouts differ from older traffic circles and rotaries?
3. How do roundabouts affect safety?
4. What are the features of a good roundabout designs?
5. What are the common types of crashes at roundabouts? What can be done to prevent them?
6. How do roundabouts affect traffic flow?
7. Are there other benefits?
8. Can roundabouts accommodate larger vehicles?
9. How do roundabouts affect older drivers?
10. Are roundabouts safe for pedestrians?
11. Do drivers favor roundabouts?
12. What are the impediments to building roundabouts?
13. How common are roundabouts in the United States?
14. Do roundabouts require more space than traditional intersections?
15. What are appropriate locations for roundabouts?
16. What types of intersections may not be good candidates for roundabouts?