Traffic can seem like a law of the universe: an ever-present, incontrovertible, inexplicable force. Back-ups simply happen, the other lanes always move faster, and nearby drivers are consistently inept. But traffic has a comprehensible logic — particular physical dynamics rule the flow of cars; psychology governs drivers’ assumptions and actions; and laws and technology underpin attempts at efficiency and safety on the road. Tom Vanderbilt, author of Traffic: Why We Drive The Way We Do and What It Says About Us, visits Zócalo to explore how human nature, our relationship to our built urban environment, and a host of other complex physical, psychological, and social interactions create the phenomenon of traffic.