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In page Roundabout:

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In the mid-2010s, about 3% of the then circa 4,000 U.S. modern roundabouts were located in Carmel, Indiana, whose mayor James Brainard had been actively promoting their construction; because of increased safety, injuries caused by car accidents in the city dropped by 80% after 1996.[1]: 0:02  As of December 2015 there were about 4,800 modern roundabouts in the United States.[citation needed] As an example, Washington state contained about 120 roundabouts as of October 2016, all having been built since 1997, with more planned.[9]