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

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mini roundabouts

Mini Roundabouts

Hillary Isebrands, PEFHWA Resource Center

existing mini roundabout design guidance
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

fhwa field testing marketing and crash test analysis for mini roundabouts research project
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.
existing mini roundabouts in us
Existing Mini Roundabouts in US
  • Davis, CA (2)
  • Diamondale, MI
  • Dover, DE
  • Stevensville, MD
  • Waco, TX (2)

Photos courtesy of VHB

mini roundabouts1
Mini Roundabouts

Dover, DE

Waco, TX

Photos courtesy of VHB

implementation of at least 10 new mini roundabouts in the us
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
contact joe bared at fhwa joe bared@dot gov for more information
Contact Joe Bared at FHWA ( for more information

Photos courtesy of Hillary Isebrands