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March 2008 Traffic Volume Trends

Travel Trends (March 2008)

Based on preliminary reports from the State Highway Agencies, travel during March 2008 on all roads and streets in the nation changed by -4.3 percent resulting in estimated travel for the month at 246.3** billion vehicle-miles.

This total includes 82.3 billion vehicle-miles on rural roads and 164.0 billion vehicle-miles on urban roads and streets.

Cumulative Travel changed by -2.3 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 1983 are also included.

Travel in Millions of Vehicle Miles All Roads and Streets
Year March Year to Date Moving 12-Month
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 253,495 697,501 2,971,892
2006 256,432 709,339 3,004,578
2007 257,297 704,939 3,009,681
2008 246,323 688,732 2,986,082

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. Because of the limited sample sizes, caution should be used with theses estimates. The highway Performance Monitoring System provides more accurate information on an anual basis.

** System entries may not add up to the give "All Systems" total due to rounding on pages 2 to 8.

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Steven Jessberger
Office of Highway Policy Information
202-366-5052
E-mail Steven

 

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United States Department of Transportation - Federal Highway Administration