The Brookings Institution works on a range of issues through their Metropolitan Policy Program, which has always been interested in transportation. In November 2012, program fellow Martha Ross finished this trenchant look at improving transportation connections within the D.C. region. The 41-page paper contains a number of interesting findings, including the observation that almost 90 percent of residents in the Washington, D.C. region live in neighborhoods with access to transit coverage of some kind. The report begins by describing the data and methods used to examine transit access and commutes in the region. It goes on to present a series of measures that characterize transit access and employment opportunities for residents at multiple geographies. The report makes effective use of maps and charts, and it's a thorough look at a subject that is gaining currency around the United States.