The document discusses the Citi Bike bike sharing system in New York City. It provides details on the planning, launch, expansion, usage, and impact of Citi Bike. Key points include that Citi Bike launched in 2013 with 5,000 bikes and 330 stations, and as of 2014 had over 12.5 million trips taken. The system connects to the subway system and has helped increase bicycling and retail sales in the city. There are ongoing plans to expand Citi Bike to more neighborhoods.