Car Free America

Car Free America

A Roundabout Guide

Mark R. Brown, AICP, CNU's avatar
Mark R. Brown, AICP, CNU
Jan 21, 2026
∙ Paid

If you’ve followed my work, you know I’m passionate about multimodal solutions that prioritize people over cars. Amazingly, modern roundabouts accommodate both. They’re a proven safety countermeasure backed by FHWA and recent data showing 75–82% reductions in severe crashes. They calm speeds, cut conflict points, accommodate bikes and pedestrians, and often outperforms signals in real-world urban settings. Is there anything they don’t do?

I created a 20-page guide to brief planners, elected officials, and community members on roundabouts and help them advocate for roundabouts in their communities. In this guide, you’ll get:

  • Key design principles

  • Multimodal best practices (safe pedestrian crossings, bike provisions, and accessibility for all users)

  • Policy considerations (when to push for roundabouts in planning, retrofitting tips, and common design pitfalls to avoid)

Paid subscribers can download the guide at the link below.

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