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Traffic Volume Trends - August 2005

Based on preliminary reports from the State Highway Agencies, travel during August 2005 on all roads and streets in the nation changed by 0.1 percent resulting in estimated travel for the month at 262.5** billion vehicle-miles.

This total includes 97.4 billion vehicle-miles on rural roads and 165.1 billion vehicle-miles on urban roads and streets.

Cumulative Travel changed by +0.2 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.

Travel in Millions of Vehicle Miles
All Roads and Streets

Year August Year to Date Moving 12-Month
1980 138,666 1,012,541 1,518,343
1981 143,464 1,036,644 1,544,959
1982 153,300 1,063,190 1,576,815
1983 157,649 1,101,649 1,630,940
1984 164,920 1,149,718 1,697,177
1985 169,437 1,187,295 1,754,347
1986 173,977 1,225,904 1,813,371
1987 177,378 1,282,053 1,894,389
1988 184,503 1,351,281 1,993,556
1989 194,172 1,409,867 2,084,172
1990 197,057 1,446,267 2,143,440
1991 204,063 1,457,700 2,158,934
1992 204,753 1,503,029 2,217,543
1993 209,634 1,535,998 2,280,121
1994 215,045 1,571,053 2,331,760
1995 219,216 1,624,692 2,411,226
1996 229,050 1,657,838 2,455,922
1997 233,496 1,715,864 2,540,227
1998 237,143 1,749,898 2,594,407
1999 241,503 1,778,200 2,653,665
2000 247,769 1,841,808 2,743,066
2001 253,002 1,868,284 2,773,401
2002 258,360 1,911,676 2,839,001
2003 260,179 1,926,826 2,870,658
2004 262,133 1,979,007 2,942,631
2005 262,514 1,983,270 2,966,776

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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