Highway Heaven Blog - Includes aerial photographs and commentary about certain features. - http://www.triskele.com/highway/category/interchanges/
Interstate Interchange Browser - Uses Google Maps to locate every interchange on the U.S. Interstate system. - http://www.m-plex.com/roads/cmap/int/
Interchanges - Page describing types found in the United Kingdom. Includes a link to the Bad Junctions page. - http://www.cbrd.co.uk/reference/interchanges/
Continuous Flow Intersections - Engineering firm page illustrating the connections in this feature. Includes illustrations and a video demonstration. - http://www.abmb.com/cfi.html
WhereRoadsMeet - Contains aerial photographs and descriptions of unusual or complicated facilities in the United States. - http://whereroadsmeet.8k.com/
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/
Unusual Interchanges - Diagrams and commentary of various ones in the East-Central U.S. - http://www.lostagain.net/unint/
Michigan Left Turn - Describes how this unusual intersection feature works, including history. - http://www.michiganhighways.org/indepth/michigan_left.html
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/
California Freeway Interchanges - Photographs from around the state. - http://members.cox.net/mkpl/interchange/interchange.html