Roundabouts Database is an online, publicly accessible inventory of roundabouts and circular intersections covering the United States, Canada, and other countries. It offers an interactive map that plots entries visible in the map view, a searchable index of sites, prebuilt reports and charts (including Live Charts and Power BI), and background materials with summary posters. The resource positions itself as the most comprehensive roster available and provides headline estimates - about 11,900 roundabouts in the U.S. through 2025 and about 1,400 in Canada through 2024 - along with site-level listings and commonly requested charts for pattern and count analysis.
Contributions are managed: prospective submitters must email [email protected] to request an account and describe their background, with preference to transportation professionals and committed enthusiasts; accounts may be removed at the site owner’s discretion. To add a site, contributors double-click the map to open a submission form and are asked to complete it fully and include a reference link; incomplete entries, private circulars, and cul-de-sac-style features are likely to be delayed or deleted because curation is volunteer-led. Recent platform changes include a migration of mapping to Azure (2025-06-30), implementation of a login system (2022-10-18), and a home/selection step to manage Microsoft Bing aerial photo transactions (2022-08-26). © 2026 Kittelson & Associates, Inc.
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