Figure 3-1
Travel Time Index by Metro Area Population for 75 Metro Areas: 2001

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KEY: TTI = Travel Time Index.

NOTE: The TTI is the ratio of peak period travel time to free-flow travel time. It expresses the average amount of extra time it takes to travel during the peak period relative to free-flow travel.

SOURCE: Texas A&M University, Texas Transportation Institute, 2003 Urban Mobility Report (College Station, TX: 2003), also available at http://tti.tamu.edu/, as of October 2003.