(and generally high quality) To be licensed, cabbies must master a comprehensive London geography/traffic test, the knowledge required to pass it is literally

(and generally high quality) To be licensed, cabbies must master a comprehensive London geography/traffic test, the knowledge required to pass it is literally known as "The Knowledge"[0]. [0] https://en.wikipedia.org/wiki/Taxicabs_of_the_United_Kingdom#The_Knowledge https://en.wikipedia.org/wiki/Taxicabs_of_the_United_Kingdom...