2-2 Highway Travel: 1970–2013
| Year | Trillions of vehicle-miles (unadjusted) |
|---|---|
| 1970 | 1.120328 |
| 1971 | 1.185616 |
| 1972 | 1.268363 |
| 1973 | 1.308287 |
| 1974 | 1.289644 |
| 1975 | 1.330073 |
| 1976 | 1.409162 |
| 1977 | 1.463408 |
| 1978 | 1.548211 |
| 1979 | 1.529132 |
| 1980 | 1.520856 |
| 1981 | 1.550269 |
| 1982 | 1.592481 |
| 1983 | 1.649108 |
| 1984 | 1.716770 |
| 1985 | 1.774763 |
| 1986 | 1.838240 |
| 1987 | 1.924328 |
| 1988 | 2.025586 |
| 1989 | 2.107040 |
| 1990 | 2.147501 |
| 1991 | 2.172214 |
| 1992 | 2.247152 |
| 1993 | 2.296705 |
| 1994 | 2.357587 |
| 1995 | 2.422776 |
| 1996 | 2.482201 |
| 1997 | 2.560373 |
| 1998 | 2.625363 |
| 1999 | 2.679459 |
| 2000 | 2.746926 |
| 2001 | 2.795611 |
| 2002 | 2.855509 |
| 2003 | 2.890222 |
| 2004 | 2.964789 |
| 2005 | 2.989430 |
| 2006 | 3.014371 |
| 2007 | 3.031124 |
| 2008 | 2.976528 |
| 2009 | 2.956762 |
| 2010 | 2.966963 |
| 2011 | 2.945815 |
| 2012 | 2.954189 |
| 2013 | 2.965579 |
| 2014 | 3.015620 |
Note: Data for 2007 and later years may not be comparable to previous years due to changes in methodology.
Source: U.S. Department of Transportation, Federal Highway Administration, Traffic Volume Trends, available at www.fhwa.dot.gov as of September 2015.