TRB’s National Cooperative Highway Research Program (NCHRP) Report 572: Roundabouts in the United States explores methods of estimating the safety and operational impacts of roundabouts and examines updated design criteria for roundabouts. Also available are appendixes to the report, published as NCHRP Web-Only Document 94, which includes detailed reviews of the literature on safety performance and operational models, the master inventory of U.S. roundabouts assembled for this project, and the results of the statistical testing of various models.
The materials linked to below may be adapted for use in presentations to the public on roundabouts.
• 4-Page Single-Fold Handout •PowerPoint Module 1—Introduction to Roundabouts •PowerPoint Module 1—Introduction to Roundabouts (with narration) •PowerPoint Module 2—Roundabouts: What They Are, and What They Are Not •PowerPoint Module 2—Roundabouts: What They Are, and What They Are Not (with narration) •PowerPoint Module 3—Safety Considerations •PowerPoint Module 3—Safety Considerations (with narration) •PowerPoint Module 4—Roundabout Intersection Operations •PowerPoint Module 4—Roundabout Intersection Operations (with narration) •PowerPoint Module 5—Roundabouts: How They Are Used •PowerPoint Module 5—Roundabouts: How They Are Used (with narration) •PowerPoint Module 6—A 21st Century Transportation Network •PowerPoint Module 6—A 21st Century Transportation Network (with narration)