When modelling transport (kg x km), I`m wondering how to to differentiate between the number of trucks required to move a particular weight. For example, modelling the transport of 1 tonne of PET granules may require 1 truck, whereas the transport of that same 1 tonne of PET bottles (much larger volume but equal weight!) will require exponentially more trucks to travel the same distance.
As far as I can tell this isn`t captured without additional parameters.
Please advise if possible - any input would be greatly appreciated.