“In the spring issue of The Mathematical Intelligencer, Michael Kleber, a topologist at MIT, waxed enthusiastic about [the interchange’s] ‘non-trivial braiding‘: while it is possible to just lift I-95 up and away from I-695, the northbound lane of I-95 braids both over, and then under, the southbound lane, making it impossible to pull them apart without cutting one of the lanes.” This leads me to wonder, of course, if you could take-over the US Department of Transportation, and rebuild the nation’s highway infrastructure as a massive textbook in driveable knot theory.

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