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Roundabout Practices (2016) / Chapter Skim
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... ROUNDABOUT PRACTICES Over the past 25 years, traffic roundabouts have gone from nonexistent in the United States to being found in every state. In that time, state agencies have continued to update their roundabout policies, guidance, and practices, and this synthesis documents and summarizes these practices within state departments of transportation (DOTs)
From page 2...
... 2 use of design guidance, design life, design-vehicle guidance, and illumination of roundabouts. A brief summary of responses, detailed in chapter three, is provided here: • The primary reason cited for the selection of roundabouts is improved safety performance compared with other intersection options, followed by shorter vehicular delays and higher capacity.

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