Green squares, circles might save your life

NYT – They are all over Mexico City, mainly on sidewalks but occasionally in the middle of the street: green rectangles and circles, as small as a window fan or as large as a trampoline, each with four white arrows directed toward a white dot in the center. They are a way to organize and account for people in life-or-death emergencies like earthquakes.

http://www.nytimes.com/2016/07/21/world/what-in-the-world/that-green-square-or-circle-in-mexico-city-might-save-your-life.html?_r=0

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