Freight Facts and Figures 2008

Figure 3-11. Peak-Period Congestion on High-Volume Truck Portions of the National Highway System: 2035

Assuming no change in network capacity, the number of NHS miles with recurring congestion and a large number of trucks is forecast to increase four fold between 2002 and 2035. On highways carrying more than 10,000 trucks per day, recurring congestion will slow traffic on more than 4,800 miles and create stop-and-go conditions on an additional 23,300 miles.

Figure 3-11. U.S. map showing congestion throughout California and I-5 to Washington and I-15 to Utah, Arizona, I-40 in New Mexico, eastern Texas, and most of the East except central Illinois, southern Georgia, and northern Maine.

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Note:

High-volume truck portions of the National Highway System carry more than 10,000 trucks per day, including freight-hauling long-distance trucks, freight-hauling local trucks, and other trucks with six or more tires. 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.

Source:

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

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