An VRML rendering of the 15-91 interchange, Corona California. A 4-level stack with one loop. Requires a VRML plugin to view. http://interchange.tvheaven.com
Continuous Flow Intersections Engineering firm page illustrating the connections in this feature. Includes illustrations and a video demonstration. http://www.abmb.com/cfi.html
Highway Feature of the Week Large archive of maps and descriptions of unusual or complicated facilities, primarily in the United States. http://www.gribblenation.com/hfotw/
Interchange of the Week Detailed entries for locations in New York State, using official state aerial photography. http://www.empirestateroads.com/week/
Museum of Dumb Highway Design Aerial photos of and commentary on various interchanges which the author finds unusual or substandard. http://www.weathergraphics.com/tim/dumbroad/