Vehicle miles of travel (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||Jun-01||Jun-02|
|Millions of highway miles||242,334||246,385|
|Vehicle miles percent change from same month previous year||-0.38||1.67|
NOTE: The current value is compared to the value from the same period in the previous year to account for seasonality.
A trendline has been provided for vehicle miles traveled. The trend has been calculated through a statistical procedure called Structural Modeling, in which the time series under study is decomposed into seasonal, trend and irregular components. For further information on this statistical procedure, see: S.J. Koopman, et al., Structural Time Series Analyser Modeller and Predictor (STAMP), London: Timberlake Consultants Ltd., 2000
SOURCE: U.S. Department of Transportation, Federal Highway Administration, Office of Highway Policy Information, available at http://www.fhwa.dot.gov/ohim/tvtw/tvtpage.htm.