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Congestion is a significant problem in America’s urban areas. This is well documented in the
Texas Transportation Institute’s Urban Mobility Report. Powered by 2010 INRIX traffic data,
the 2011 Congested Corridors Report includes analysis along 328 specific (directional) freeway
corridors in the United States. These corridors include many of the worst places for congestion
in the United States, and the detailed data allow for more extensive analysis and a better picture of the locations, times and effects of stop-and-go traffic. The report doesn’t list every bad location for congestion, but the issues explored here advance the understanding of when, how and where congestion occurs.