Highly recommend this NYT article about the people who use the High Line to commute to work, rather than for a swoony park experience. Lots of cities are looking to do High Line copycat projects these days, like the Hoover-Mason Trestle park in Bethlehem, or the Reading Viaduct in Philly, and looking at them mainly through a parks and recreation lens. But I think it’s also important to look at them through a pedestrian transportation lens. It’s great for pedestrians to not have to wait for cars to cross the street, not have to think about getting run over by cars, etc. By the same token, you could fix up some alleys and close them to car traffic so that people can take advantage of alternative pedestrian-only routes that minimize interaction with the car transportation network.