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Travel Time Index

Embedded Dataset Excel:

Dataset Excel:

table_01_70_092021.xlsx (37.72 KB)


The Travel Time Index is the ratio of the travel time during the peak period to the time required to make the same trip at free-flow speeds. A value of 1.3, for example, indicates a 20-minute free-flow trip requires 26 minutes during the peak period.

Methodology and data sources have been changed in 2019; these figures are not comparable to those in past editions of NTS. Population group is based on 2020 population.


KEY: NA = not applicable; R = revised.

Very large urban areas – 3 million and over population.

Large urban areas – 1 million to less than 3 million population.

Medium urban areas – 500,000 to less than 1 million population.

Small urban areas – less than 500,000 population.

a Rank is based on the calculated percent change with the highest number corresponding to a rank of 1.

b  Averages weighted by Vehicle Miles Traveled.


Texas A&M Transportation Institute, 2021 Urban Mobility Report, (College Station, TX: 2021), available at as of Sept. 8, 2021.