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Please consult Roundabouts: An Informational Guide for more information. U.S. Department of Transportation. Federal Highway Administration. Education is vitalThis guide was developed through the National Cooperative Highway Research Program Project 03-. 65A, Update of FHWA's Roundabouts: An Informational Guide. Roundabouts: An Informational Guide – Second Edition The following files are available to download for free. For more information about downloading files,