"The Street Seats program enables seasonal public open spaces, generally including seating and tables, at locations where sidewalk seating is not available. During warm-weather months, when the demand to spend time outdoors increases, Street Seats may temporarily replace a few parking spots in a neighborhood to create an attractive setting for eating, reading, working, meeting a friend, or taking a rest."
Read more about them here:
http://www.nyc.gov/html/dot/html/pedestrians/streetseats.shtmlDiscuss them here: