U.S. Highway Vehicle-Miles Traveled
Monthly data, not seasonally adjusted

Vehicle-miles traveled (VMT) are key data for highway planning and management, and a common measure of roadway use. Along with other data, VMT are often used in estimating congestion, air quality, and potential gas-tax revenues, and can provide a general measure of the level of the nation's economic activity.
| Vehicle-Miles Traveled | Jul-12 | Jul-13 | 
|---|---|---|
| Highway miles (millions) | 259,443 | 263,607 | 
| Percent change from same month previous year | - 0.3% | + 1.6% | 
NOTE: The current value is compared to the value from the same period in the previous year to account for seasonality.
SOURCE: U.S. Department of Transportation, Federal Highway Administration, Office of Highway Policy Information, Traffic Volume Trends, available at http://www.fhwa.dot.gov/ as of October 2013.