Traffic flow, in short, is alternately inhibited in one direction while being permitted in another. There is order. Now imagine that the policeman falls asleep on the job. There will ensue tremendous activity as cars from all directions attempt to move through the intersection, their drivers increasingly frustrated, their horns joined in a deafening cacophony. Despite all the commotion, there is little progress. Fewer and fewer cars are able to move purposefully. There is disorder.
