It’s Bike To Work Day 2010 in San Francisco, a city where people take their biking seriously. As famous as San Francisco is for its bicycle-friendly attitude, transportation planning for the city remains a highly contested issue. Bicyclists always want more bike lanes, while the opposition will go to court to prevent painting new “sharrows” on the streets. For city policymakers, proving things like the demand for new bike routes is not as simple as it sounds, which is where mobile location-based technology comes in handy.