I'm trying to understand what kind of effect adding lanes has on the effectiveness of highway transport and I...can't. Suppose you have a single lane highway between A and B. In theory, its capacity is infinite.
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...assuming you're going full speed. If you go slow because of a jam, not sure what determines the capacity, but i suspect the junctions.
No idea. The more I think about this the more confused I become... The only thing I'm sure of is that tripling the number of lanes on a highway is not equivalent to tripling the cross-sectional area of a water pipe. More water goes through the pipe than cars through the highway.