Citi Bike is expanding its sharing program into parts of Brooklyn.

Department of Transportation Commissioner Polly Trottenberg says after the expansion, there will be 40,000 bikes and Citi Bike will be the second or third bike sharing system in the world.

New docking stations are currently being installed in East Williamsburg, Bushwick and parts of Queens. The next phase calls for it to be rolled out in upper Manhattan, parts of Brooklyn and in the south.

"You're wondering how you get to and from," said Rep. Michael Blake. "You have to think about last weekend when you have a power outage, this is a game changer."

Citi Bike recently came under fire for its lack of diversity. A report found that the program was mostly available in affluent neighborhoods and lacking in low-income and minority communities.

The citywide bike sharing program will be implemented over the next five years with a $100 million investment from Lyft.