When I was a graduate student, we would often sit around thinking nerdy thoughts. One topic that might come up was the concept of traffic. The problem was this: what is the most optimal driving method?
Some would compare traffic to fluid dynamics. But this model is faulty (the reasons are beyond the scope of this post, but if you are interested, just ask). Others would compare traffic to kinetic-molecular theory or collision theory bringing in the idea of Brownian motion. (also another faulty model)
What was my thoughts? Glad you asked! I think traffic is best modeled by game theory. Therefore, one strategy should be for drivers to attempt to be in Nash equilibrium.
Any questions?
see also: traffic psychology, intelligent transportation systems, road safety