"Low-traffic neighborhoods," as the Brits call them, deploy low-cost interventions to steer traffic away from certain streets to make space for pedestrians and cyclists. In this week's Friday video,UN-award-winning Streetfilms auteur Clarence Eckerson Jr.'s travels around leafy Londonwith urban planner Solomon Green-Eames. Their sunny jaunt should inspire deep envy in every New York urbanist. The key to these neighborhoods, which have no exact equivalent in America's biggest city, are "modal filters" that divert car traffic while allowing bicycles and pedestrians to roll and walk freely.