Of all the countries I have visited, lived or worked in (and that is a lot), I'd say you can toss a coin to choose between Nigeria and India.
Which country has the worst drivers?
I have to agree with the others but I always thought Italy has the worst drivers! Almost got ran over a couple of times in Rome. Also, I thought Piccadilly Circus was a madhouse but at least it seemed that drivers knew what they were doing.
I can't speak for the whole country - but as a pedestrian in Beijing observing the drivers - I think they are hard to beat! I saw someone do a U turn on a six- lane highway. Scary!