Object Lessons is a series of short, beautifully designed books about the hidden lives of ordinary things.Speed. Bump. Speed. Traffic considers the history and philosophy of roundabouts, speed bumps, the pedestrian mall, and other efforts to manage traffic. Exploring ways to reign in the power of the internal combustion engine, ramp back century-long efforts to increase the flows of traffic, and establish greater balance between humans and machines, Paul Josephson considers the history of traffic, and the political and other controversies that frame the belated technological efforts to calm it. Object Lessons is published in partnership with an essay series in The Atlantic.