Dan Reed, a city planner with insights into urban design, dives into the quirks of Washington, D.C.'s iconic traffic circles. He explains how these circles, stemming from L'Enfant's grand vision, confuse newcomers while being a rite of passage for locals. Reed discusses the differences between traffic circles and roundabouts, the impact of cars on their design, and contrasts successful circles like DuPont and Thomas. He sheds light on the balance between pedestrian access and vehicle movement, revealing the ongoing evolution of these urban features.