United States Department of Transportation
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Application of Detailed Interchange Analysis to Top Freight Bottlenecks: Methods, Results, and Road Map for Future Research
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2007-03-19
[PDF-4.13 MB]
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Abstract:The objective of this project was to conduct a feasibility study to determine how to model the delay associated with highway interchanges and then develop an interchange bottleneck delay estimator that can be applied to the national list of significant highway interchange bottlenecks. This study builds on the work performed for the report, "An Initial Assessment of Freight Bottlenecks on Highways" (Cambridge Systematics, Inc., October 2005) (see TRIS 01019963). In that report, truck bottlenecks were defined by a combination of three features: the type of constraint, the type of roadway, and the type of freight route. One of the major results of this study verified previous notions about truck bottlenecks – that urban interchanges heavily used by weekday commuters represent the overwhelming source of delay for trucks. However, the methodology used previously to estimate delay and perform the rankings is a very simple scanning level of analysis. Given the importance of these types of bottlenecks, a more rigorous delay analysis was decided upon and the results are presented herein.
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