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Based on preliminary reports from the State Highway Agencies, travel during March 2006 on all roads and streets in the nation changed by 0.7 percent resulting in estimated travel for the month at 253.2** billion vehicle-miles.
This total includes 89.4 billion vehicle-miles on rural roads and 163.8 billion vehicle-miles on urban roads and streets.
Cumulative Travel changed by +1.5 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.
| Year | March | Year to Date | Moving 12-Month |
|---|---|---|---|
| 1981 | 127,798 | 353,612 | 1,525,489 |
| 1982 | 128,182 | 345,451 | 1,542,108 |
| 1983 | 132,814 | 364,078 | 1,611,107 |
| 1984 | 137,307 | 377,319 | 1,662,349 |
| 1985 | 144,424 | 387,912 | 1,727,363 |
| 1986 | 151,183 | 407,707 | 1,794,558 |
| 1987 | 157,573 | 433,488 | 1,864,021 |
| 1988 | 167,836 | 458,463 | 1,949,303 |
| 1989 | 174,990 | 481,473 | 2,048,595 |
| 1990 | 178,771 | 495,930 | 2,121,497 |
| 1991 | 179,076 | 490,316 | 2,141,887 |
| 1992 | 183,778 | 511,634 | 2,193,532 |
| 1993 | 187,869 | 522,393 | 2,257,911 |
| 1994 | 196,190 | 531,948 | 2,306,260 |
| 1995 | 201,227 | 566,118 | 2,391,757 |
| 1996 | 204,172 | 564,198 | 2,420,856 |
| 1997 | 211,952 | 586,028 | 2,504,031 |
| 1998 | 214,222 | 598,259 | 2,572,603 |
| 1999 | 220,763 | 605,830 | 2,632,934 |
| 2000 | 232,627 | 635,579 | 2,709,208 |
| 2001 | 232,995 | 643,702 | 2,755,048 |
| 2002 | 236,486 | 660,029 | 2,811,937 |
| 2003 | 237,087 | 659,583 | 2,855,062 |
| 2004 | 251,656 | 688,100 | 2,918,967 |
| 2005 | 251,347 | 691,374 | 2,965,765 |
| 2006 | 253,130 | 701,529 | 2,975,527 |
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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