The march of the ants holds clues for humans - International Herald Tribune

http://www.iht.com/articles/2007/11/12/healthscience/12ants.php --- If you have ever observed ants marching in and out of a nest, you might have been reminded of a highway buzzing with traffic. To Iain Couzin, such a comparison is a cruel insult - to the ants.  Americans spend a total of 3.7 billion hours a year in congested traffic. But you will never see ants stuck in gridlock.