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3 Background Roundabout research and guidance has expanded in the last decade, including planning, analysis, design, and construction. Technology changes have taken place, substantial research on the different aspects of roundabouts has been performed, and many roundabouts have been constructed. The research and experience gained from these projects has provided many relevant findings and lessons learned. However, additional research is needed to address the gaps in available roundabout guidance and to incorporate the relevant technology, the findings of the new and earlier research and the lessons learned from the constructed projects into a guide for roundabouts. This guide would provide updated information and guidance on all aspects of roundabouts and help highway agencies and other organizations address relevant issues when considering the planning and implementation of roundabouts. The objective of this research was to develop a guide that would serve as the primary source for guidance on all aspects of roundabouts.
