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Travel by Vehicle Type (Travel Index 1970 = 100)
| Year | Cars | 2 Axle-4 Tire Trucks | Other Single Unit Trucks | Combination Trucks | All Motor Vehicles | All Trucks |
|---|---|---|---|---|---|---|
| 1970 | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| 1971 | 105.4% | 111.8% | 107.0% | 105.9% | 106.2% | 106.4% |
| 1972 | 111.4% | 127.0% | 116.0% | 115.9% | 113.5% | 115.9% |
| 1973 | 114.1% | 143.4% | 124.3% | 129.9% | 118.3% | 127.5% |
| 1974 | 109.9% | 148.2% | 123.5% | 130.8% | 115.4% | 127.6% |
| 1975 | 112.8% | 162.8% | 127.8% | 133.0% | 119.6% | 130.7% |
| 1976 | 117.6% | 183.2% | 134.4% | 141.4% | 126.4% | 138.3% |
| 1977 | 121.0% | 203.3% | 145.3% | 158.5% | 132.2% | 152.7% |
| 1978 | 125.1% | 226.6% | 157.8% | 179.3% | 139.2% | 170.0% |
| 1979 | 121.5% | 236.8% | 155.1% | 190.7% | 137.8% | 175.2% |
| 1980 | 121.3% | 236.0% | 147.0% | 195.5% | 137.6% | 174.4% |
| 1981 | 123.6% | 240.4% | 146.1% | 196.8% | 140.2% | 174.7% |
| 1982 | 126.7% | 248.3% | 150.1% | 201.4% | 143.7% | 179.1% |
| 1983 | 130.4% | 265.8% | 157.1% | 209.4% | 148.9% | 186.7% |
| 1984 | 133.9% | 290.4% | 164.0% | 220.2% | 155.0% | 195.8% |
| 1985 | 136.0% | 317.1% | 167.8% | 222.2% | 159.9% | 198.5% |
| 1986 | 138.6% | 343.8% | 168.5% | 230.7% | 165.3% | 203.6% |
| 1987 | 143.6% | 370.6% | 177.3% | 243.3% | 173.1% | 214.6% |
| 1988 | 149.5% | 407.4% | 182.5% | 252.0% | 182.6% | 221.8% |
| 1989 | 152.9% | 435.1% | 187.8% | 261.5% | 188.9% | 229.4% |
| 1990 | 153.6% | 466.0% | 191.7% | 268.5% | 193.2% | 235.1% |
| 1991 | 148.2% | 526.7% | 195.3% | 275.1% | 195.7% | 240.4% |
| 1992 | 149.6% | 573.4% | 198.9% | 283.2% | 202.5% | 246.5% |
| 1993 | 150.0% | 604.9% | 209.6% | 293.5% | 206.9% | 257.0% |
| 1994 | 153.4% | 620.2% | 226.3% | 310.0% | 212.4% | 273.6% |
| 1995 | 156.9% | 640.8% | 231.5% | 328.6% | 218.3% | 286.4% |
| 1996 | 160.1% | 662.3% | 236.2% | 338.4% | 224.0% | 294.1% |
| 1997 | 163.9% | 690.1% | 247.0% | 354.6% | 230.8% | 307.8% |
| 1998 | 168.6% | 702.6% | 250.7% | 364.8% | 236.6% | 315.1% |
| 1990 | 171.7% | 730.8% | 259.6% | 376.5% | 242.5% | 325.8% |
| 2000 | 175.3% | 749.5% | 260.6% | 384.8% | 247.8% | 330.8% |
Source: Office of Highway Policy Information, Federal Highway Administration
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