The number of miles traveled nationally by vehicles for a period of 1 year. VMT is either calculated using 2 odometer readings or, for vehicles with less than 2 odometer readings, imputed using a regression estimate. (DOE5)
the total number of miles traveled by all vehicles for a defined geographic area over a specified period of time; one VMT equals one vehicle traveling one mile, thus two vehicles traveling ten miles or ten vehicles traveling two miles is 20 VMT
The number of miles traveled within a specific geographic location by vehicles for a period of one year. VMT is calculated either by using two odometer readings or, in the absence of one of the odometer readings, by regression estimate.