It started with some colored pencils.
A little girl said her favorite color was pink. Her dad said he could prove her wrong. He took all her colored pencils and lined them up by length. The result was obvious: her most-used colored pencil was blue, not pink. It’s hard to argue with the data.
This got me thinking. What other kinds of answers can we find by looking at data that appears in the real world as a byproduct of what has been “used up” or “worn down”? What can we tell from what’s left over?
Quite a lot, it turns out. Rebecca Saltzman, a director of the Bay Area Rapid Transit, recently shared an image of rail spikes pulled from the BART tracks. Compared to the new one in the center, the old, rusted spikes look dangerously worn away. This display of visual evidence – an inadvertent bar chart – makes one thing extremely clear: BART is in dire need of repair.
If you’ve ever ventured out of the house in the few hours or days after a huge snow storm, you’ve likely noticed something different about street corners. Namely, that they are covered in inches of snow. Despite snow plows’ best efforts, these mountains of snow build up over days and can stick out many feet from the curb. And this leftover snow can actually reveal valuable information: the places where cars don’t drive.
By narrowing the streets and extending the sidewalks, the buildup of snow creates a temporary “neckdown”, an urban planning technique for calming traffic. Sidewalk extensions (permanent or snow-created) force cars to slow down as they make a turn, protecting pedestrians and cyclists. And as New York videographer/transportation hobbyist Clarence Eckerson Jr. points out in this video documenting snowy neckdowns (or “sneckdowns”) in the wild, cars seem to have no trouble navigating these much safer turns. Sneckdowns have become so popular that they’ve even got their own hashtag.
Once again, the visual evidence of what’s been used (or in this case, driven over) is valuable data. Leftover snow could provide urban designers, transportation engineers and pedestrian activists with important data to make real world public safety decisions. It could also inspire more creative and less costly ways to build better and safer streets.
Paths don’t have to emerge out of the snow to be useful, either. “Desire paths” are spontaneous trails that are worn into existence from repeated use (sometimes called “cow paths” or “social trails”). Sometimes these paths are quite literal: stomped shortcuts through a field or visible tracks around an obstacle. Other times the paths are metaphorical, brought up in digital contexts to argue for creating better user experiences.