I'll keep this one short. I am currently visiting Bangalore - in the context of a business trip - and these are my observations/thoughts about the traffic in the streets here :)

Most trucks don't have tail lights. I mean, who needs to see trucks in the highway anyways? :) There are trucks parked in the highway. On a lane. Not kidding! There are cars going in reverse in the middle of the road (also saw it once in a highway) Some people bike their way *against* the traffic flow (on the highway as well)! Lane marks are basically useless. If you have 3 lanes, you will probably have 5 cars side by side :) Using the horn is a form of communication. Seems to be analogous to the Sonar systems in the submarines. During the night lights are also used intensively for this purpose :) Roads have close to no illumination, which makes it much easier to run people over. You know, the ones that are crossing the highway on foot. Drivers will pass you wherever there is space open. Left, right, middle, doesn't really matter. Use the sonar :) There are signs saying "Please respect the traffic rules", hehe :) You can spot the occasional tractor in the highway. Most people don't speak a lot of English, but they all drive like Nigel Mansell or Damon Hill:)