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Essentially, it serves as the "bike" option that Google Maps doesn't offer alongside "Public Transit" and "Walking" when searching for directions. Hopefully this will help people choose safer routes - I cringe every time I see someone riding down Ashland or Western... there are such great alternates like Damen, if only people knew it had a non-shared bike lane on most of it!
An Alpha for Chicago is available here: http://geos.ridethecity.com/chicago#