TABLE 2-3-4 - Travel Time Index by Metro Area: 1982 to 2005

TABLE 2-3-4 - Travel Time Index by Metro Area: 1982 to 2005

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The Travel Time Index (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 in the peak period relative to free-flow travel. A value of 1.35, for example, indicates a 20-minute free-flow trip requires 27 minutes during the peak period.

Travel Time Index

Urban areas 1982 1995 2004 2005
Very Large        
Atlanta, GA 1.10 1.25 1.32 1.34
Boston, MA-NH-RI 1.08 1.20 1.27 1.27
Chicago, IL-IN 1.12 1.31 1.44 1.47
Dallas-Fort Worth-Arlington, TX 1.05 1.16 1.31 1.35
Detroit, MI 1.13 1.26 1.30 1.29
Houston, TX 1.19 1.19 1.32 1.36
Los Angeles-Long Beach-Santa Ana, CA 1.25 1.44 1.48 1.50
Miami, FL 1.11 1.26 1.37 1.38
New York-Newark, NY-NJ-CT 1.10 1.24 1.36 1.39
Philadelphia, PA-NJ-DE-MD 1.12 1.18 1.27 1.28
Phoenix, AZ 1.15 1.17 1.27 1.31
San Francisco-Oakland, CA 1.15 1.35 1.38 1.41
Washington, DC-VA-MD 1.12 1.32 1.37 1.37
Large        
Baltimore, MD 1.07 1.20 1.29 1.30
Buffalo, NY 1.03 1.04 1.08 1.08
Cincinnati, OH-KY-IN 1.04 1.16 1.18 1.18
Cleveland, OH 1.03 1.11 1.10 1.09
Columbus, OH 1.03 1.15 1.20 1.19
Denver-Aurora, CO 1.09 1.22 1.30 1.33
Indianapolis, IN 1.08 1.24 1.23 1.22
Kansas City, MO-KS 1.02 1.07 1.08 1.08
Las Vegas, NV 1.06 1.25 1.31 1.30
Milwaukee, WI 1.05 1.13 1.13 1.13
Minneapolis-St. Paul, MN 1.04 1.18 1.24 1.26
New Orleans, LA 1.11 1.16 1.15 1.15
Oklahoma City, OK 1.02 1.07 1.09 1.09
Orlando, FL 1.10 1.27 1.30 1.30
Pittsburgh, PA 1.06 1.10 1.10 1.09
Portland, OR-WA 1.07 1.20 1.27 1.29
Providence, RI-MA 1.03 1.08 1.17 1.16
Riverside-San Bernardino, CA 1.03 1.19 1.35 1.35
Sacramento, CA 1.06 1.21 1.32 1.32
San Antonio, TX 1.04 1.10 1.23 1.23
San Diego, CA 1.07 1.22 1.41 1.40
San Jose, CA 1.13 1.25 1.32 1.34
Seattle, WA 1.07 1.30 1.28 1.30
St. Louis, MO-IL 1.07 1.18 1.16 1.16
Tampa-St. Petersburg, FL 1.20 1.30 1.29 1.28
Virginia Beach, VA 1.07 1.16 1.18 1.18
Medium        
Akron, OH 1.02 1.06 1.08 1.07
Albany-Schenectady, NY 1.02 1.04 1.08 1.08
Albuquerque, NM 1.05 1.16 1.16 1.17
Allentown-Bethlehem, PA-NJ 1.06 1.14 1.14 1.14
Austin, TX 1.07 1.18 1.29 1.31
Birmingham, AL 1.04 1.09 1.15 1.15
Bridgeport-Stamford, CT-NY 1.06 1.16 1.21 1.22
Charlotte, NC-SC 1.07 1.13 1.25 1.23
Dayton, OH 1.07 1.12 1.11 1.10
El Paso, TX-NM 1.02 1.07 1.16 1.17
Fresno, CA 1.05 1.11 1.12 1.12
Grand Rapids, MI 1.03 1.09 1.11 1.10
Hartford, CT 1.03 1.08 1.11 1.11
Honolulu, HI 1.11 1.21 1.20 1.22
Jacksonville, FL 1.07 1.20 1.22 1.21
Louisville, KY-IN 1.11 1.17 1.23 1.23
Memphis, TN-MS-AR 1.04 1.11 1.14 1.13
Nashville-Davidson, TN 1.09 1.13 1.17 1.17
New Haven, CT 1.03 1.08 1.10 1.11
Omaha, NE-IA 1.04 1.11 1.16 1.16
Oxnard-Ventura, CA 1.03 1.12 1.22 1.24
Raleigh-Durham, NC 1.04 1.11 1.17 1.18
Richmond, VA 1.04 1.09 1.09 1.09
Rochester, NY 1.02 1.05 1.07 1.07
Salt Lake City, UT 1.05 1.19 1.21 1.19
Sarasota-Bradenton, FL 1.10 1.15 1.19 1.19
Springfield, MA-CT 1.04 1.06 1.06 1.06
Toledo, OH-MI 1.02 1.07 1.10 1.09
Tucson, AZ 1.10 1.13 1.22 1.23
Tulsa, OK 1.03 1.07 1.09 1.09
Small        
Anchorage, AK 1.06 1.06 1.07 1.07
Bakersfield, CA 1.01 1.04 1.08 1.09
Beaumont, TX 1.02 1.03 1.05 1.05
Boulder, CO 1.04 1.09 1.09 1.10
Brownsville, TX 1.02 1.04 1.07 1.06
Cape Coral, FL 1.07 1.15 1.12 1.12
Charleston-North Charleston, SC 1.08 1.14 1.18 1.17
Colorado Springs, CO 1.02 1.07 1.12 1.14
Columbia, SC 1.02 1.04 1.07 1.07
Corpus Christi, TX 1.03 1.04 1.05 1.06
Eugene, OR 1.04 1.04 1.08 1.10
Laredo, TX 1.02 1.06 1.09 1.09
Little Rock, AK 1.02 1.04 1.07 1.07
Pensacola, FL-AL 1.03 1.08 1.11 1.11
Salem, OR 1.02 1.07 1.09 1.09
Spokane, WA 1.02 1.05 1.05 1.04
85-Area Average 1.11 1.22 1.29 1.30
Very Large Area Average 1.14 1.29 1.36 1.38
Large Area Average 1.07 1.18 1.24 1.24
Medium Area Average 1.05 1.12 1.16 1.16
Small Area Average 1.03 1.07 1.09 1.09

NOTES: Travel Time Index - The ratio of travel time in the peak period to the travel time at free-flow conditions. A value of 1.35 indicates a 20 minute free-flow trip takes 27 minutes in the peak. Free-flow speeds (60 mph on freeways and 35 mph on principal arterials) are used as comparison threshold.

Very Large Urban Areas - over 3 million population. Large Urban Areas - over 1 million and less than 3 million population. Medium Urban Areas - over 500,000 and less than 1 million population. Small Urban Areas - less than 500,000 population.

SOURCE: Texas A&M University, Texas Transportation Institute, 2007 Urban Mobility Report (College Station, TX: 2005), available at http://tti.tamu.edu/ as of September 2007 as cited in U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, National Transportation Statistics, table 1-64, available at http://www.bts.gov/publications/national_transportation_statistics/ as of October 2008.