Mamdani wants to pedestrianize “vast swaths” of the new congestion pricing zone, along with streets near public open space and schools. It’s an ambitious vision, though not impossible. Paris has transformed even more radically than New York, turning a highway into park space, planting tens of thousands of parking spaces with trees, closing more than 100 streets to cars, charging SUVs extra to park, and making rush hour look more like Copenhagen, with streets filled with bikes. Other cities have also reshaped around pedestrians, like Barcelona, which now has several car-free superblocks.