Matt Miller shapes his schedule around the area’s public transportation infrastructure. He said his system for getting around was nearly perfect, but the influx of bicycle sharing into Cambridge completed it. Cambridge, Somerville, Brookline, and Boston are participating in a “Rolling Launch Party” Wednesday to celebrate the expansion of the Hubway Bicycle Share system. “I ride the bus, I ride the T, and this is like the third ingredient,” said Miller, 39, an assistant dean at Harvard University.
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