Roff Smith, writing for National Geographic, in an excellent feature about a test that all London cabbies have to pass. It’s a long read, but the whole thing is incredibly fascinating:
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.
Add to that the locations of another 20,000 landmarks and points of interest—pubs, clubs, museums, parks, monuments, railway stations, tube stations, hospitals, schools, police stations, government buildings, embassies, cemeteries, churches, guild halls, theaters, cinemas—any place, in other words, a fare-paying passenger might conceivably ask to be taken or an examiner might challenge you to find.
—Monday, 22 September 2014