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Bay Area Bike Share will expand to a 7,000-bike system over the next two years and venture into Oakland, Berkeley, and Emeryville. San Francisco's system will dramatically increase to 4,500 bikes, and San Jose's will expand to 1,000.

The mayors of all five cities announced the expansion today along with Motivate, the system's operator (formerly known as Alta), which will enlarge the system tenfold "at no cost to taxpayers."

Here are the details, according to a Mayor's Office press release:

Motivate’s proposal includes bringing a total of 850 bikes to Oakland, 400 to Berkeley and 100 to Emeryville, and boosting the number of bikes in San Francisco to 4,500 from the current 328, and the number in San Jose to 1,000 from the current 129. Motivate plans to add 150 more bikes to the Bay Area Bike Share fleet after the four-phase expansion is complete in late 2017. While the locations of these bikes have not been identified, Motivate proposes to keep at least 50 of them in the East Bay.

Supervisor Scott Wiener issued a statement applauding "this proposal to dramatically expand bike share," as he has pushed for. “A robust and sustainable bike share network is a key part of being a Transit First city and will allow us to reap the benefits of bike share, including reducing traffic, improving public transit, and stimulating the local economy," he said.

Mayor Ed Lee issued this statement:

When we launched Bay Area Bike Share nearly two years ago, we saw a transformation in the way that residents and visitors moved around the Bay Area with an easy, convenient, affordable and healthy transportation option in our world-class transportation network. The proposed expansion of this popular bike share program will help residents and visitors move around our diverse San Francisco neighborhoods, and around the Bay Area region more easily.

This is the first wave of expansion since new management took over at Alta Bicycle Share and changed the company's name to Motivate in January.

Motivate also operates bike-share systems in New York, DC, Boston, Chicago, and Seattle.

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