- An VRML rendering of the 15-91 interchange, Corona California.
- A 4-level stack with one loop. Requires a VRML plugin to view.
- Museum of Dumb Highway Design
- Aerial photos of and commentary on various interchanges which the author finds unusual or substandard.
- Alaska Roundabouts
- Shows different facilities, with a focus on Alaska. Also discusses technical aspects.
- Center for Transportation Research and Training
- Gives descriptions and comparisons to traffic circles. Includes a photo gallery of selected examples.