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• W651817401 abstract "This research investigates the Gravity Model application for the statewide freight flow distribution process at a commodity level. In earlier studies, an inventory system was established and key commodities of Virginia were found. Freight flow production and attraction equations were then developed for Virginia counties. Here the Gravity Model was applied in the distribution stage for the key commodities. Four commodity flow scenarios at statewide and interstate level were considered to define flows within and between Virginia and external regions. Friction factors were calculated and calibrated for both internal-internal flows and external-internal flows for the truck mode at the county level. Here friction factors were calculated with regression analysis using the log-form of the gamma function and calibrated with the trip length distribution and root mean squared error method. K-factors were introduced to adjust the flows and aid in the predictive ability of the model. The model then was tested in the forecasting mode. Freight flow production and attraction equations were applied with socioeconomic factors to forecast future productions and attractions. After the productions and attractions were determined for the year 2003, the calibrated Gravity Model was applied to forecast freight flow distribution. This research shows that the Gravity Model is appropriate for forecasting freight flows in terms of commodity flow tonnage. These outputs need to be adjusted to show mode and vehicle flows, which need to be addressed in future research." @default.
• W651817401 created "2016-06-24" @default.
• W651817401 creator A5046653990 @default.
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• W651817401 date "2002-08-01" @default.
• W651817401 modified "2023-09-27" @default.
• W651817401 title "CALIBRATION OF THE GRAVITY MODEL FOR TRUCK FREIGHT FLOW DISTRIBUTION" @default.
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