Freight Facts and Figures 2012
Figure 3-16. Peak-Period Congestion on the National Highway System: 2040
Assuming no changes in network capacity, increases in truck and passenger vehicle traffic are forecast to expand areas of recurring peak-period congestion to 37 percent of the NHS in 2040 compared with 11 percent in 2007. This will slow traffic on 21,000 miles of the NHS and create stop-and-go conditions on an additional 40,000 miles.
Notes:
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 flow ratios between 0.75 and 0.95. The volume/service flow ratio is estimated using the procedures outlined in the HPMS Field Manual, Appendix N.
Sources:
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 3.4, 2012.
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