The Multiplex

You may have thought that a multiplex was only a place to watch movies. Guess again! Watching movies would be quite dangerous at a HIGHWAY Multiplex. In the context of big roads, a multiplex is the area where roads split or converge. A good sampling of US this species in the U.S. (and even one in Canada) can be found at:

http://multiplexes.ohhighways.com/

Multiplexes are exciting because they often cause highways to suddenly enlarge, swell, and otherwise upgrade. Is this because multiple streams of federal funding converge at interstate multiplexes? A multiplex near me, the divergence of I-495 and I-678 is one of the most glorious urban interstates in New York City...but the congestion in that area is also, more often than not, a real dog. Who is responsible for improving it?