| Mode of | Year | |||
| transportation | 1960 | 1970 | 1980 | 1990 |
| U.S. working population, in millions | ||||
| Private vehicle | 42.99 | 61.96 | 83.02 | 101.29 |
| Public transit | 7.81 | 6.51 | 6.01 | 5.89 |
| Walked to work | 6.42 | 5.69 | 5.41 | 4.49 |
| Worked at home | 4.66 | 2.69 | 2.18 | 3.41 |
| Total | 61.87 | 76.85 | 96.62 | 115.07 |
| percent of U.S. working population | ||||
| Private vehicle | 69.48 | 80.63 | 85.92 | 88.02 |
| Public transit | 12.62 | 8.48 | 6.22 | 5.12 |
| Walked to work | 10.37 | 7.40 | 5.60 | 3.90 |
| Worked at home | 7.54 | 3.49 | 2.26 | 2.96 |
Source: U.S. Department of Commerce, Bureau of the Census, Census of Population and Housing for 1960, 1970, 1980, and 1990 (GPO, Washington, DC, decennial).
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