Office of Operations Freight Management and Operations

Freight Facts and Figures 2011

Figure 3-15. Peak-Period Congestion on High-Volume Truck Portions of the National Highway System: 2007

Congested highways carrying a large number of trucks substantially impede interstate commerce, and trucks on those segments contribute significantly to congestion. Recurring congestion slows traffic on 4,700 miles and creates stop-and-go conditions on 3,700 miles of the NHS that carry more than 8,500 trucks per day.


Figure 3-15. U.S. map showing recurring peak-period congestion on high-volume truck portions of the National Highway System for year 2007. Notes: High-volume truck portions of the National Highway System carry more than 8,500 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 have reduced traffic speeds with volume/service ratios between 0.75 and 0.95.

[JPEG 591KB, PDF 2.4MB]


U.S. Department of Transportation, Federal Highway Administration, Office of Highway Policy Information, Highway Performance Monitoring System; and Office of Freight Management and Operations, Freight Analysis Framework, version 3.1, 2010.


You will need the Adobe Reader to view the PDFs on this page.

Office of Operations