Mini Roundabouts Hillary Isebrands, PE FHWA Resource Center

2 Existing Mini Roundabout Design Guidance Typical ICD Range: 45 – 90 ft 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

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 Davis, CA (2) Diamondale, MI Dover, DE Stevensville, MD Waco, TX (2) Photos courtesy of VHB

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

6 Mini Roundabouts – Diamondale, MI Photos courtesy of VHB

Courtesy of VHB

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 for more Photos courtesy of Hillary Isebrands