Office of Operations Freight Management and Operations

Peak-Period Congestion on High-Volume Truck Portions of the National Highway System: 2045 Map

U.S. map with projections for 2045 showing congestion throughout most of the country, with the exception of the central states.  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 segment 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.  Source: U.S. Department of Transportation, Federal Highway Administration, Office of Freight Management and operations, Freight Analysis Framework, version 4.3, 2017.

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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 segment 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.

Source

U.S. Department of Transportation, Federal Highway Administration, Office of Freight Management and operations, Freight Analysis Framework, version 4.3, 2017.

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