Average Daily Ridership, Washington D.C. Metro

It's good to see that more people are taking public transportation. I wonder if the sharp increase since 2001 might be because of rising environmental consciousness and/or rising gas prices. http://www.swivel.com/graph...

Please see my comparison of this graph and the DC city population. There is much more here in terms of the growth of the metro area and how it has happened at the expense of urban schools and local culture. http://www.swivel.com/graph...