London Cabbies Must Pass Grueling Geography Test

To become a London cabdriver, a person must acquire "The Knowledge": a deep, comprehensive understanding of London's labyrinthine streets. It isn't unusual for candidates, known as Knowledge Boys and Girls, to spend five years in self-guided preparation for the grueling entrance exams, and many end up dropping out. But those who pass emerge with an unrivaled understanding of the city's complicated roadways.

Click to learn more about what it takes to get The Knowledge and pass the tests.