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Traffic Volume Trends - August 2004

Based on preliminary reports from the State Highway Agencies, travel during August 2004 on all roads and streets in the nation changed by -0.4 percent resulting in estimated travel for the month at 259.3** billion vehicle-miles.

This total includes 101.0 billion vehicle-miles on rural roads and 158.2 billion vehicle-miles on urban roads and streets.

Cumulative Travel changed by 1.4 percent.

Note: Annual travel has been adjusted to match the Highway Performance Monitoring System for 2003. While the adjustment to total travel was less than one percent, rural travel declined 5% and urban travel increased 4% because of this adjustment. The larger changes to rural and urban travel are primarily because of the expansion in urban boundaries reflected in the 2000 census. Travel estimates for 2004 and beyond will also reflect this adjustment.

Travel for the current month, the cumulative yearly total, as well as the moving 12-month total on all roads and streets is shown below. Similar totals for each year since 1979 are also included.

Travel in Millions
All Roads and Streets

Year August Year to Date Moving 12-Month
1979 139,942 1,023,331 1,535,931,300
1980 138,666 1,012,541 1,518,343,005
1981 143,464 1,036,644 1,544,958,802
1982 153,300 1,063,190 1,576,815,444
1983 157,649 1,101,649 1,630,939,695
1984 164,920 1,149,718 1,697,176,594
1985 169,437 1,187,295 1,754,347,222
1986 173,977 1,225,904 1,813,371,409
1987 177,378 1,282,053 1,894,388,807
1988 184,503 1,351,281 1,993,556,156
1989 194,172 1,409,867 2,084,172,127
1990 197,057 1,446,267 2,143,440,130
1991 204,063 1,457,700 2,158,933,595
1992 204,753 1,503,029 2,217,542,953
1993 209,634 1,535,998 2,280,120,710
1994 215,045 1,571,053 2,331,759,654
1995 219,216 1,624,692 2,411,226,079
1996 229,050 1,657,838 2,455,921,877
1997 233,496 1,715,864 2,540,227,359
1998 237,143 1,749,898 2,594,407,324
1999 241,503 1,778,200 2,653,664,837
2000 247,769 1,841,808 2,743,066,214
2001 253,509 1,869,054 2,774,171,129
2002 258,690 1,911,223 2,839,456,495
2003 260,335 1,926,313 2,870,597,612
2004 259,281 1,953,818 2,918,398,446

Traffic Volume Trends is a monthly report based on hourly traffic count data. These data, collected at approximately 4,000 continuous traffic counting locations nationwide, are used to determine the percent change in traffic for the current month compared to the same month in the previous year. This percent change is applied to the travel for the same month of the previous year to obtain an estimate of travel for the current month.

System entries may not add to give "All Systems" total due to rounding for page 2 to 8.

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