Tom Vanderbilt How did pedestrians become an endangered species in the United States—and why is the word “pedestrian” wrong anyway? First in a four-part series: “A few years ago, at a highway safety conference in Savannah, Ga., I drifted into a conference room where a sign told me a ‘Pedestrian Safety’ panel was being held. “The speaker was Michael Ronkin, a French-born, Swiss-raised, Oregon-based transportation planner whose firm, as his website notes, ‘specializes in creating walkable and bikeable streets.’ Ronkin began with a simple observation that has stayed wit...