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For London's Cabbies, Job Entails World's Hardest Geography Test

A fascinating article about The Knowledge – the test one must pass to operate a black cab on the streets of London:

To qualify for that elusive green badge, you need to learn by heart all 320 sample runs that are listed in the Blue Book, the would-be cabbie’s bible. You will also have to commit to memory the 25,000 streets, roads, avenues, courts, lanes, crescents, places, mews, yards, hills, and alleys that lie within a six-mile radius of Charing Cross.