And Psychologists!
Reading the comments in this thread is quite amusing.
As a driver in India, i can tell you anything goes as long as you don't get into an accident (which may/may-not kill you) or get caught by the police.
No rules matter and the only goal is to "one-up" everybody else on the road and if they are trying to "one-up" you, then prevent it by any means possible. It is a "game of chicken" in its purest form; game theory in action. Rules are mere suggestions only followed by the meek and the weak.
You have no idea how invigorating it is to drive in India.
I did have a weird experience in Miami one time, driving the same truck. This guy behind me in a Charger suddenly shot around me in the side lane right as traffic started moving, and got in front. Traffic was heavy (brutal) and I wasn't lagging behind and wasting time/space, or so I thought, but I guess my standards of proper "closeness" are different than what he expected. It was funny, actually. I guess he was just in a hurry.
Do you have any experience driving in China? How does it compare?