For all that, you can thank the Knowledge, a 153-year-old system for memorizing every street and landmark in a six-mile area of central London. The Knowledge requires all cabbies to navigate between any two points in the city entirely from memory. Hopeful drivers study for three to fours years, traverse London on a motor scooter to learn the shortest routes across town and are required to pass a series of intense oral exams -- all before they can get behind the wheel of a taxi. It's a process unmatched anywhere in the world.
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