Any normal sidewalk would be wide enough that a single person could not conceivably block it, and wearing headphones while walking, especially noise canceling ones, is popular because US cities are largely unpleasant, deafeningly loud places full of fast-moving cars.
Any normal sidewalk would be wide enough that a single person could not conceivably block it, and wearing headphones while walking, especially noise canceling ones, is popular because US cities are largely unpleasant, deafeningly loud places full of fast-moving cars.