Three truck classes
The truck model converted commodity flows into truck trips using data from a combination of surveys and data from the 2002 Census Bureau. First, the tons were allocated to the three truck classes in the model (light-heavy duty freight trucks, medium-heavy duty freight trucks, and heavy-heavy duty freight trucks). Next, the tons in each of the truck classes were converted to truck trips using the payload data from the intercept surveys. Weigh-in-motion data were used to convert annual truck trips to daily truck trips. This disaggregation process converted the annual truck tons in the commodity flow database into a daily zone-level truck trip table.
The internal component of the truck model is being updated based on new truck travel surveys. This component will estimate truck travel for trips where both the origin and the destination are within one of the six counties. The newer internal model will be a three-step shipping rates freight truck model just like the current model.
Tags: shipping rates