Fast Company reports on how MapQuest gets you from here to there:

MapQuest uses state-of-the-art satellite images and computer algorithms, but it also relies on actual observations in the field. So it is that an army of modern-day explorers is continually remapping the nation. As Clark steers a Ford Taurus through Avalon Way's newest streets, she recites what she sees, starting with street names and building numbers at the beginning and end of a block. "Hemison-- H-e-m-i-s-o-n --Court. There's a gate . . . number four is on the right."

...via elearningpost