Office of Operations Freight Management and Operations

Freight Facts and Figures 2008

Figure 3-9. Peak-Period Congestion on the National Highway System: 2035

Assuming no changes in network capacity, increases in truck and passenger vehicle traffic are forecast to expand recurring, peak- period congestion to 40 percent of the NHS in 2035 compared with 11 percent in 2002. This will slow traffic on nearly 20,000 miles of the NHS and create stop-and-go conditions on an additional 45,000 miles.


Figure 3-9. U.S. map showing congestion throughout California and in much of Oregon, Washington, Utah, and Arizona, most of Texas, and most of the East except central Illinois, southern Georgia, and northern Maine.

[JPEG 419KB, PDF 2.2MB]


Highly congested segments are stop-and-go conditions with volume/service flow ratios greater than 0.95. Congested segments reduce traffic speeds with volume/service flow ratios between 0.75 and 0.95


U.S. Department of Transportation, Federal Highway Administration, Office of Freight Management and Operations, Freight Analysis Framework, version 2.2, 2007.



Download the free adobe acrobat reader to view PDFs You will need the Adobe Acrobat Reader to view the PDFs on this page.

Office of Operations