I don't know why this never occurred to me before, but today on Twitter, several people who are attending the 2011 Accessibility Summit pointed out that traffic lights aren't, traditionally, accessible. Think about it. If you're colorblind, does red, yellow, green tell you as much information as you need, as easily and quickly as you need to know it?
Image: Sprocket at en.wikipedia. Used via CC.
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.