So how does this math work?
"Almost 40 percent of Bay Area commuters live within just five miles of their workplace, a bike-able distance for even inexperienced cyclists. If every person living this close to their workplace ditched their cars on Bike to Work Day alone, more than 60,000 vehicles would be off the road"
Are we only 150000 (60000/0.4) people working (or driving to work...) in the Bay Area? Or am I missing some more advanced math here?