20 May 2009
The subtypes of highway intersections
Highway engineers no longer consider the cloverleaf to be the optimal interchange (because cars exit and enter via the same lane). Other configurations are necessary when one highway ends, when three highways meet, or when topography limits choices.
Infrastructurist offers a two-part guide that explains the "turbine," "stack," "spaghetti bowl," "spooey," "braid" and many others, with text and illustrative photos. Pictured above - the Butt, the T-bone, and the Volleyball.
Actually quite interesting. Part 1 here. Part 2 here.