The transportation model may eventually consist of a module that represents total demand for transportation services in countries and regions and of additional modules that represent how individual societies meet individual and commercial transportation needs. At this stage, however, the transportation module focuses exclusively on annual sales of cars and trucks.
We have developed two approaches to forecasting those sales (a total of four options for the user). GDP per capita at purchasing power parity is the primary driver of sales per capita in most of those options (in one case total GDP drives total sales, see Approach 2). Values of the indices for survival/self-expression and traditional/secular-rational values may join GDP per capita or GDP in determining the annual sales of cars and trucks.
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