Roundabouts Database
5 hours ago
- The Roundabouts Database is a comprehensive public inventory of roundabouts and circular intersections, serving the Transportation Research Board and the public.
- It features five public tabs, including 'Quick facts' with data through 2021.
- Account requests for new site submissions require emailing roundabouts@kittelson.com with background; approval is for legitimate users, prioritizing transportation professionals and enthusiasts.
- For adding sites, users double-click on the map at the intersection, then fill out a form with as much detail as possible, including a link for more information; incomplete entries may be delayed or deleted.
- The database excludes circular intersections that function as cul-de-sacs or are in private complexes; voluntary curation is limited, so prioritization is used.
- Recent updates: switched to Azure mapping (2025-06-30), implemented a login system for contributions (2022-10-18), and added a landing page with buttons to reduce Bing map transactions (2022-08-26).