From the introduction to the report:
"Over the last two decades, the other four boroughs have been steadily growing their own vibrant job centers, in neighborhoods like Flushing, Queens, and East Flatbush, Brooklyn. Consequently, the number of commuters who travel to work in their own boroughs or to neighboring boroughs or counties has been growing much faster than the number of commuters who make the more traditional trip into Manhattan. For example, in the Bronx, the number of commuters traveling to Queens and Westchester County grew by 38 percent between 1990 and 2008, whereas the number going to Manhattan increased by just 13 percent in the same time period. Similarly lopsided numbers hold for Brooklyn, Queens and Staten Island.
If New York is going to retain a world-class public transportation system and sustain job growth outside of Manhattan, it must invest in solutions that make these less traditional commuter trips easier for passengers."