The cost to the taxi driver of gaining The Knowledge is far higher than $200, so the people who do it take their job very seriously, and they are in general ext

The cost to the taxi driver of gaining The Knowledge is far higher than $200, so the people who do it take their job very seriously, and they are in general extremely safe and reliable. There's a marked difference in quality of service between minicab drivers who use GPS units and black cab drivers who don't need them. They both exist in London, and given the choice, I'll go with a black cab every time.