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Roundabout implementation in the United States has increased in the last decade, and practitioners have learned lessons in successfully applying roundabouts in various land use and transportation environments and contexts.

Associated with NCHRP Research Report 1043: Guide for Roundabouts, which provides information and guidance on all aspects of roundabouts, the TRB National Cooperative Highway Research Program's NCHRP Web-Only Document 347: Background and Summary of a Guide for Roundabouts describes the development of the guide and the research on which it is based.

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