Forecasting Statewide Freight Toolkit (2008) / Chapter Skim
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Pages 16-26
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From page 16... ...
These publications include the Institute of Transportation Engineers' Trip Generation Handbook7, the National Cooperative Highway Research Program's Truck Trip Generation Data8, and the C H A P T E R 5 Data Sources
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From page 17... ...
Federal Highway Administration's Quick Response Freight Manual3, and Accounting for Commercial Vehicles in Urban Transportation Models.9 National Surveys Shipper surveys typically require a nationwide sample. While a survey of shippers within the target market area will provide a sound picture of outbound shipments, this limited coverage will otherwise miss inbound activity.
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From page 18... ...
Traffic movements originating in warehouses or distribution centers or drayage movements of intermodal rail or air freight are shown as STCC 50. These are by definition truck movements.
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TRANSEARCH is available for purchase from Reebie Associates at http://www.reebie.com. STB Carload Rail Waybill Sample STB is the official authority of the Carload Waybill Sample.
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From page 20... ...
Vehicle conversion is generally done for commodity flow by trucks, since freight trucks are assigned together with automobiles and other trucks as daily trip tables. Tons to Vehicles The assignment model component for truck freight on highways, described in Section 4.0, is most often calculated in terms of daily truck trips.
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From page 21... ...
The factor to be used to covert from annual tonnage to annual trucks could 21 Database File Name Content Domestic Flows Domestic State-to-state flows By commodity By mode By year (1998, 2010, 2020) International Flows International International flows (by state origin or destination)
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From page 22... ...
Area California SCTG Electronic and other electrical equipment and components and office equipment Characteristic Value ($ million)
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From page 23... ...
The end result was the completed FAF highway network database containing traffic volume, capacities, speeds, locations, and travel times for each road segment. The Highway Capacity Dataset contains estimated truck volumes and system capacities for each road segment on the FAF network, obtained through freight demand analysis.
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From page 24... ...
Freight Analysis Framework highway network.
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From page 25... ...
Thus, truck classification counts and weight and motion counts prepared by states can be used in validating the truck portion of freight models only in combination with a multi-class assignment of all vehicles. Tolled facilities with electronic data collection mechanisms also can provide a way to validate freight forecasts, since trucks could theoretically be tracked on an individual basis and extensive data about truck movements (including entry-exit points)
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From page 26... ...
The first digit identifies a major Economic Division, such as 2-Nondurable manufacturing. The second digit identifies an Economic Major Group, such as 20-Food and kindred spirits.
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