Do roundabouts have less delay than traffic signals?

At locations where traffic volumes are relatively balanced between the intersecting roadways, roundabouts can often handle traffic with much less delay than a comparable traffic signal. A 2010 county study compared the signalized intersection of 10th Street and Inwood Ave in Lake Elmo with the roundabout intersection at Radio Drive and Bailey Road in Woodbury during the afternoon rush hour. Although the intersections have very similar traffic volumes, the study found that drivers at the roundabout incurred 58% less delay than at the traffic signal, despite the fact that the traffic signal has sixteen approach lanes while the roundabout has only eight.

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1. Do roundabouts work?
2. Are roundabouts safer for drivers than traffic signals?
3. Are roundabouts safer for pedestrians than traffic signals?
4. Are roundabouts less expensive than traffic signals?
5. Do roundabouts have less delay than traffic signals?
6. How do multi-lane roundabouts work?
7. What is the difference between a roundabout, traffic circle, and rotary?
8. Do roundabouts accommodate buses/trucks?
9. What should I do if I am in a roundabout at the same time as an emergency vehicle?
10. What impacts do roundabouts have on surrounding property?
11. Why do rural roundabouts have sidewalks?
12. What NOT to do