Bangalore = IT City = back office of the world = outsourced centre = city that's awake 24 hours = white cabs at all hours = cab drivers.
These aren't like the cabbies of NY or anywhere in the world. I can't give you an exact figure but I'm sure there are over 5000 cab drivers in the city, ferrying people to work and back at all odd hours of the day and night.
Here is one, immortalizing the crowd. And a salut.