Freeway Knot Theory

Some help from knot theorists would be appreciated. Here is a photoshopped picture of a freeway (based on a real one in Oakland, California) that needs to be untangled.

(Tip of the cap to Stanley Somers.)

Note: The original version of my post described the picture incorrectly as being an actual freeway. See this link. Also, this freeway is knotted up even more severely. :)