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June 2008 Traffic Volume Trends

Travel Trends (June 2008)

Based on preliminary reports from the State Highway Agencies, travel during June 2008 on all roads and streets in the nation changed by -4.7 percent (-12.2 billion vehicle miles) resulting in estimated travel for the month at 250.2** billion vehicle-miles.

This total includes 86.7 billion vehicle-miles on rural roads and 163.6 billion vehicle-miles on urban roads and streets.

Cumulative Travel changed by -2.8 percent (-42.1 billion vehicle miles)..

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 June Year to Date Moving 12-Month
1983 146,738 787,177 1,621,968
1984 153,403 823,096 1,685,027
1985 158,703 850,976 1,744,650
1986 162,370 880,813 1,804,600
1987 167,826 928,892 1,886,319
1988 178,690 981,999 1,977,435
1989 184,094 1,024,710 2,068,297
1990 189,529 1,053,740 2,136,069
1991 193,467 1,055,250 2,149,011
1992 197,232 1,091,660 2,208,624
1993 199,414 1,116,525 2,272,018
1994 207,280 1,141,229 2,321,409
1995 211,370 1,188,287 2,404,645
1996 215,551 1,203,679 2,438,167
1997 222,254 1,245,655 2,524,178
1998 228,733 1,272,811 2,587,529
1999 235,970 1,293,581 2,646,133
2000 243,012 1,348,956 2,734,833
2001 243,547 1,365,124 2,763,094
2002 247,913 1,396,983 2,827,469
2003 252,193 1,404,346 2,862,871
2004 257,364 1,452,611 2,938,486
2005 263,778 1,473,962 2,986,159
2006 263,062 1,483,714 2,999,147
2007 262,480 1,480,805 3,003,194
2008 250,232 1,438,723 2,954,326

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
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United States Department of Transportation - Federal Highway Administration