SPUI's SPUI list:
A list of single point urban interchanges, a fairly new type of
interchange. Includes information on what a SPUI is.
http://web.mit.edu/spui/www/spui/
Interchange Diagrams:
Interchanges in Florida and New Jersey, U.S.
http://web.mit.edu/spui/www/int/
Michigan Left Turn:
Describes how this unusual intersection feature works, including
history.
http://members.aol.com/MichiganHwys/MichiganLeft/
Jughandles:
Outline of this at-grade feature found mostly in New Jersey, U.S.
http://web.mit.edu/spui/www/jug.html
Unusual Interchanges:
Diagrams and commentary of various ones in the East-Central U.S.
http://mahn0.tripod.com/unint/
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/
The Center-Turning Overpass:
Introduces a design proposal where left- and right-turning traffic
in an intersection is placed on elevated roadways.
http://www.centerturn.com/
The Echelon Interchange:
Professional paper on this part-at-grade, part-grade-separated
intersection. (.pdf document - requires Adobe Acrobat Reader)
