United States Department of Transportation
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NC truck network model development research.
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2008-09-01
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[PDF-1.07 MB]
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Alternative Title:North Carolina truck network model development research
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Edition:Final report; July 1, 2005-June 30, 2008.
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Abstract:This research develops a validated prototype truck traffic network model for North Carolina. The model
includes all counties and metropolitan areas of North Carolina and major economic areas throughout the
U.S. Geographic boundaries, population and employment define the study areas. The network is based on
the National Highway Planning Network and it includes Interstates, US Highways, and secondary roads.
The North Carolina network attributes include highway type, speed, and terrain. The base year long haul
truck data is based on FHWA Freight Analysis Forecasting origin-destination data for North Carolina
including origins and destinations outside North Carolina. Short haul traffic and back haul truck traffic are
generated using simplified trip generations rates and adjustments to the FAF data. Base year 2006 truck
traffic estimates for North Carolina are validated by over 450 truck traffic counts throughout the state.
Only ADTT (average daily truck traffic) is estimated by the network model, not total vehicle traffic
including automobiles. Since the model does not include automobile trips and truck-only traffic is usually
far below roadway capacity, the current network model is not built with a capacity-constrained traffic
assignment feature. The network is sensitive to input speed but not to traffic volumes on the highway.
Consequently any network changes for scenario testing have to be expressed in terms of speed changes to
the network links affected.
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