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Backpacking through Europe in my 20s, my sense of direction served me well—until I hit the cities with the truly medieval street plans. So in Florence, after renting a motorcycle, I devised a clever way to find the garage again: Next to the garage was an impressive, obviously important brick building, with a large arrow and some Italian words pointing to it. I observed these same signs along the street pointing back towards this building, so I knew that if I got close enough, the signs would lead me back to the building and the garage.

Attempting to return at the end of the day, I located the signs, began following them—and was soon hopelessly lost. It was only after going in a complete circle that I realized what was written on the sign—Senso Unico—was Italian for "One Way."

To follow arrows is human-behavior-meets-graphic-design 101. So it may not surprise you to learn that these gigantic concrete arrows dotting America, from east to west, are for wayfinding.

See more pics and read the rest at Core77