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Based on preliminary reports from the State Highway Agencies, travel during May 2004 on all roads and streets in the nation changed by -0.1 percent resulting in estimated travel for the month at 252.9 billion vehicle-miles.
This total includes 102.6 billion vehicle-miles on rural roads and 150.3 billion vehicle-miles on urban roads and streets.
Cumulative Travel changed by 2.3 percent.
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 | May | Year to Date | Moving 12-Month |
|---|---|---|---|
| 1979 | 132,394 | 617,344 | 1,566,497,586 |
| 1980 | 131,269 | 605,946 | 1,517,735,231 |
| 1981 | 134,305 | 616,382 | 1,531,292,061 |
| 1982 | 140,283 | 615,579 | 1,549,465,699 |
| 1983 | 143,619 | 640,438 | 1,617,340,158 |
| 1984 | 151,046 | 669,693 | 1,678,362,517 |
| 1985 | 156,726 | 692,273 | 1,739,350,296 |
| 1986 | 160,459 | 718,443 | 1,800,932,686 |
| 1987 | 167,776 | 761,065 | 1,880,862,270 |
| 1988 | 178,042 | 803,309 | 1,966,571,674 |
| 1989 | 184,823 | 840,616 | 2,062,892,784 |
| 1990 | 189,247 | 864,210 | 2,130,634,292 |
| 1991 | 191,929 | 861,783 | 2,145,073,911 |
| 1992 | 196,725 | 894,428 | 2,204,858,249 |
| 1993 | 205,981 | 917,111 | 2,269,835,330 |
| 1994 | 206,594 | 933,949 | 2,313,542,762 |
| 1995 | 212,586 | 976,916 | 2,400,554,589 |
| 1996 | 218,676 | 988,128 | 2,433,987,023 |
| 1997 | 226,082 | 1,023,401 | 2,517,474,292 |
| 1998 | 227,899 | 1,044,079 | 2,581,050,804 |
| 1999 | 230,786 | 1,057,611 | 2,638,894,936 |
| 2000 | 242,556 | 1,105,944 | 2,727,791,628 |
| 2001 | 246,014 | 1,121,694 | 2,762,674,975 |
| 2002 | 252,681 | 1,149,008 | 2,824,601,046 |
| 2003 | 253,097 | 1,145,817 | 2,853,159,750 |
| 2004 | 252,887 | 1,172,445 | 2,905,197,614 |
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.
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