Ownership levels, personal preference, and economic factors affect the variation in usage of different types of vehicles. As a result, VMT for the vehicle types also differ. The above figure indicated that single unit truck has been growing steadily over the last decade while combination truck growths stay flat. On the passenger travel side, after decades increase in sport utility vehicle travel, the travel growth has been leveled off for the last four years.
Data Source: US Department of Transportation, Federal Highway Administration, Office of Highway Policy Information, Highway Statistics.
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