When I spent 3 weeks in Hyderabad in 2008, the red/green lights were completely ignored. As were lane markers and any other attempts at regulating traffic.

It was a complete free-wheeling anarchy. It somehow worked quite well, though I understood why I was given a 24/7 driver. I could maybe have survived driving, but I would probably have killed someone else, by not following the unwritten rules.

It remains one of the most astonishing things I have ever seen!