United States Department of Transportation
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potential for reductions in discretionary travel during peak periods.
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2008-12-01
[PDF-1.21 MB]
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Alternative Title:Examining the speed flow delay paradox in the Washington, DC region;Examining the speed flow delay paradox in the Washington, DC region : final report, December 2008;Examining the speed flow delay paradox in the Washington, DC region final report : December 2008;Examining the speed flow delay paradox in the Washington, DC region : December 2008;
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Edition:Final report
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NTL Classification:NTL-ENERGY AND ENVIRONMENT-Environment Impacts;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;NTL-INTELLIGENT TRANSPORTATION SYSTEMS-Electronic Payment and Pricing;NTL-OPERATIONS AND TRAFFIC CONTROLS-Congestion;NTL-OPERATIONS AND TRAFFIC CONTROLS-Traffic Flow;
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Abstract:Traffic congestion in the Washington, DC area, especially congestion on our freeways, costs our residents every day
in terms of wasted time, fuel, and increased air pollution. Highway studies have determined that once traffic volumes
exceed the capacity of the roadway, the system can rapidly “break down” to the point where all traffic slows
markedly, and the capacity and throughput of the roadway drops precipitously. The Federal Highway Administration
commissioned this study to specifically evaluate speed, volume and delay for congested versus uncongested travel on
some of the major roadways in the metropolitan Washington region, in order to identify the specific “tipping
point(s)” at which free-flow traffic “breaks down”, and conversely, the volume of traffic that would have to be
reduced in peak periods to keep traffic free-flowing. The study also analyzed survey data to estimate the number and
percent of trips that people take in peak hours on our freeways that are discretionary trips. Finally, the study briefly
reviewed empirical findings on experiences with congestion pricing in the US and abroad.
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