Are roundabouts less expensive than traffic signals?

Traffic signals usually require left and right turn lanes in order to operate safely and effectively, and the costs of constructing turn lanes where they do not already exist can make traffic signal implementation significantly more expensive than a roundabout. For example, US61 and 170th Street in the City of Hugo, the roundabout cost $1.2 million to construct in 2013, but the costs of constructing turn lanes and a traffic signal was estimated at $2.0 million. Because fewer approach lanes are needed at roundabouts, the project length and property impacts can also be significantly lessened, reducing or eliminating the need for property acquisition (eminent domain).

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1. Why roundabouts?
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 multilane 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 you should NOT do at roundabouts