TABLE C-1 Travel Time Index by Metro Area: 1982 to 2005

TABLE C-1 Travel Time Index by Metro Area: 1982 to 2005

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.

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

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: 2007), also available at http://tti.tamu.edu/ as of September 2007.