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Travel by Vehicle Type (Travel Index 1970 = 100)

YearCars2 Axle-4 Tire TrucksOther Single Unit TrucksCombination TrucksAll Motor VehiclesAll Trucks
1970100.0%100.0%100.0%100.0%100.0%100.0%
1971105.4%111.8%107.0%105.9%106.2%106.4%
1972111.4%127.0%116.0%115.9%113.5%115.9%
1973114.1%143.4%124.3%129.9%118.3%127.5%
1974109.9%148.2%123.5%130.8%115.4%127.6%
1975112.8%162.8%127.8%133.0%119.6%130.7%
1976117.6%183.2%134.4%141.4%126.4%138.3%
1977121.0%203.3%145.3%158.5%132.2%152.7%
1978125.1%226.6%157.8%179.3%139.2%170.0%
1979121.5%236.8%155.1%190.7%137.8%175.2%
1980121.3%236.0%147.0%195.5%137.6%174.4%
1981123.6%240.4%146.1%196.8%140.2%174.7%
1982126.7%248.3%150.1%201.4%143.7%179.1%
1983130.4%265.8%157.1%209.4%148.9%186.7%
1984133.9%290.4%164.0%220.2%155.0%195.8%
1985136.0%317.1%167.8%222.2%159.9%198.5%
1986138.6%343.8%168.5%230.7%165.3%203.6%
1987143.6%370.6%177.3%243.3%173.1%214.6%
1988149.5%407.4%182.5%252.0%182.6%221.8%
1989152.9%435.1%187.8%261.5%188.9%229.4%
1990153.6%466.0%191.7%268.5%193.2%235.1%
1991148.2%526.7%195.3%275.1%195.7%240.4%
1992149.6%573.4%198.9%283.2%202.5%246.5%
1993150.0%604.9%209.6%293.5%206.9%257.0%
1994153.4%620.2%226.3%310.0%212.4%273.6%
1995156.9%640.8%231.5%328.6%218.3%286.4%
1996160.1%662.3%236.2%338.4%224.0%294.1%
1997163.9%690.1%247.0%354.6%230.8%307.8%
1998168.6%702.6%250.7%364.8%236.6%315.1%
1990171.7%730.8%259.6%376.5%242.5%325.8%
2000175.3%749.5%260.6%384.8%247.8%330.8%

Source: Office of Highway Policy Information, Federal Highway Administration

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United States Department of Transportation - Federal Highway Administration