Ross Racine designs these amazing subdivisions by hand in Photoshop. The one above looks rather like spaghetti, but I may have driven through one like it once. It took me hours to find my way back out.
“Drawn freehand directly on a computer and printed on a high-end inkjet printer, my works do not contain photographs nor scanned material.”
There are some really interesting and imaginative designs, if not all entirely functional. Of course, I’ve flown over a good amount of subdivisions that are anything but sensical, so he’s not far off on some of them.
More can be seen in the artwork section of Racine’s site.