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Mini Roundabouts

Mini Roundabouts. Hillary Isebrands, PE FHWA Resource Center. Existing Mini Roundabout Design Guidance.

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Mini Roundabouts

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  1. Mini Roundabouts Hillary Isebrands, PEFHWA Resource Center

  2. Existing Mini Roundabout Design Guidance Small roundabouts used in low-speed urban environments often characterized by having mountable (or painted only) center islands and splitter islands. The central island should be domed using 5 to 6 percent cross slope, with a maximum height of 5 inches. Source: FHWA Guide, 2000 Typical ICD Range: 45 – 90 ft

  3. FHWA Field Testing, Marketing and Crash Test Analysis for Mini-roundabouts Research Project • This research project aims to promote well‐designed mini‐roundabout deployments in the US, quantify potential safety benefits and produce marketing materials.

  4. Existing Mini Roundabouts in US • Davis, CA (2) • Diamondale, MI • Dover, DE • Stevensville, MD • Waco, TX (2) Photos courtesy of VHB

  5. Mini Roundabouts Dover, DE Waco, TX Photos courtesy of VHB

  6. Mini Roundabouts – Diamondale, MI Photos courtesy of VHB

  7. Courtesy of VHB

  8. Implementation of at least 10 new mini roundabouts in the US • - Before and after capacity and safety data collected • - Needs to be constructed within next 18 months

  9. Contact Joe Bared at FHWA (joe.bared@dot.gov) for more information Photos courtesy of Hillary Isebrands

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