How Big?

Philadelphia Weekly has an article about Philly Car Share having to expand its image to market to a different audience. But this is fascinating.

When PhillyCarShare started five years ago, members were primarily green types—people concerned about their carbon footprints and reducing automotive dependency in urban culture. Today PhillyCarShare has more than 28,000 members, with nearly 3,800 signing up in the last month.

The rate of expansion is tremendous. On the down side, based on personal observation I'd say the expansion of people anecdotally has outpaced the expansion of cars. For awhile there was a tremendous surplus of cars.