- Museum of Dumb Highway Design - http://www.weathergraphics.com/tim/dumbroad/
Aerial photos of and commentary on various interchanges which the author finds unusual or substandard.
- The Echelon Interchange - http://www.miller-consulting.com/echelon.pdf
Professional paper on this part-at-grade, part-grade-separated intersection.
- Interchange of the Week - http://www.empirestateroads.com/week/
Detailed entries for locations in New York State, using official state aerial photography.
- Michigan Left Turn - http://www.michiganhighways.org/indepth/michigan_left.html
Describes how this unusual intersection feature works, including history.
- Unusual Interchanges - http://www.lostagain.net/unint/
Diagrams and commentary of various ones in the East-Central U.S.
- Highway Feature of the Week - http://www.gribblenation.com/hfotw/
Large archive of maps and descriptions of unusual or complicated facilities, primarily in the United States.
- WhereRoadsMeet - http://whereroadsmeet.8k.com/
Contains aerial photographs and descriptions of unusual or complicated facilities in the United States.
- Continuous Flow Intersections - http://www.abmb.com/cfi.html
Engineering firm page illustrating the connections in this feature. Includes illustrations and a video demonstration.
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