What are the features of a good roundabout designs?
Proper design can help to optimize the safety benefits of roundabouts. Centerlines of roads leading to roundabouts should be properly aligned with the central island. Approach roads should be sufficiently curved, far enough in advance of roundabouts, to reduce vehicle speeds of entering drivers. Islands separating the approach and exit lanes, known as splitter islands, should extend far enough from the roundabout to provide pedestrian refuge and to delineate the roundabout. Traffic signs, pavement markings, and lighting should be adequate so that drivers are aware that they are approaching a roundabout and that they should reduce their travel speed. With multi-lane roundabouts, signs and lane markings should help drivers chose the appropriate lane when entering and exiting the roundabout. The figures below show sample guide signs and lane markings used at roundabouts.

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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?