When you live in San Francisco, it’s not uncommon to see strange sights out your window. Once, I saw the mayor standing in the middle of the street, painting a bright green square on the asphalt. This was a historic moment, I later learned-the inauguration of the city’s first “bike box,” a designated space for cyclists to wait at an intersection.
In the 1890's, a cycling mania swept the U.S. Take a look at some of the first urban biking maps on.natgeo.com/2lHco8r—
National Geographic (@NatGeo) February 25, 2017