Citi Bike is a privately owned public bicycle sharing system serving the New York City boroughs of the Bronx, Brooklyn, Manhattan, and Queens, as well as Jersey City, New Jersey, and Hoboken, New Jersey. Named after lead sponsor Citigroup, it was operated by Motivate (formerly Alta Bicycle Share), with former Metropolitan Transportation Authority CEO Jay Walder as chief executive until September 30, 2018, when the company was acquired by Lyft. The system's bikes and stations use technology from Lyft. First proposed in 2008 by the New York City Department of Transportation, Citi Bike's scheduled 2011 opening was delayed by Hurricane Sandy and technological problems. It officially opened in May 2013 with 332 stations and 6,000 bikes. By October 2017 annual expansions brought the totals to 706 stations and 12,000 bikes, making the service the largest bike sharing program in the United States. Further expansions for Citi Bike are planned to extend its service area across the Bronx, Brooklyn, Manhattan, and Queens, and increase the number of bikes to 40,000. In October 2017 the system reached a total of 50 million rides and in July 2020 the system reached 100 million rides. , there are 169,000 annual subscribers. Monthly average ridership numbers increased above 100,000 for the first time in June 2021. The all-time record for single-day ridership occurred , when the system had 138,372 rides. Development and delays In an effort to reduce emissions, road wear, collisions, and road and transit congestion and to improve public health, the New York City Department of Transportation (NYCDOT) researched alternative forms of transportation, publishing a strategic plan in 2008. According to NYCDOT statistics, 56% of all automobile trips within the city are under (with 22% under and 10% under ), well within distances readily served by bicycle. To encourage residents to use bicycles more, the city committed to expanding bike lane miles, bike racks, and bike-parking shelters. In the 2009 bicycle share feasibility report, the New York City Department of City Planning (DCP) recommended building out the system in three phases in the four most populous boroughs, but no timeline was made public. The city, which had already been encouraging cycling as transportation, decided to establish a bicycle share program of the kind that had seen success in other cities. In 2011, it selected Alta Bicycle Share to operate the bike share in New York City. Citi Bike was created as a public–private