Traffic Volume Trends - September 2007

Based on preliminary reports from the State Highway Agencies, travel during September 2007 on all roads and streets in the nation changed by -0.9 percent resulting in estimated travel for the month at 243.0** billion vehicle-miles.

This total includes 85.3 billion vehicle-miles on rural roads and 157.7 billion vehicle-miles on urban roads and streets.

Cumulative Travel changed by -0.1 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. Similar totals for each year since 1982 are also included.

Travel in Millions of Vehicle Miles All Roads and Streets

Year	September	Year to Date	Moving 12-Month
1982	136,311	1,199,501	1,581,942
1983	139,938	1,241,588	1,634,567
1984	146,074	1,295,792	1,703,312
1985	150,424	1,337,720	1,758,697
1986	155,462	1,381,366	1,818,409
1987	164,184	1,446,236	1,903,111
1988	171,072	1,522,352	2,000,444
1989	177,326	1,587,193	2,090,426
1990	178,415	1,624,682	2,144,530
1991	183,594	1,641,294	2,164,112
1992	190,908	1,693,936	2,224,857
1993	193,765	1,729,762	2,282,978
1994	200,511	1,771,563	2,338,506
1995	203,866	1,828,558	2,414,582
1996	207,604	1,865,442	2,459,660
1997	213,547	1,929,411	2,546,170
1998	219,461	1,969,360	2,600,322
1999	224,306	2,002,507	2,658,510
2000	227,328	2,069,136	2,746,088
2001	226,000	2,094,284	2,772,073
2002	233,329	2,145,005	2,846,331
2003	236,933	2,163,759	2,874,262
2004	242,718	2,224,202	2,950,893
2005	243,436	2,252,938	2,991,227
2006	245,094	2,250,345	2,990,147
2007	242,926	2,248,546	2,994,636

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 these estimates. The Highway Performance Monitoring System provides more accurate information on an annual basis.

** System entries may not add up to given "All Systems" total due to rounding for Page 2 to 8.

September 2007 Traffic Volume Trends