Peak-Period Congestion on the National Highway System: 2002 Map

U.S. map showing heavy congestion in major cities and moderate congestion on intercity routes in California and Florida.

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Note

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.

Source

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 2.2, 2007.

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