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Right.
And for the weight thing, I guess the test would be to drive a fully loaded semi and an unloaded one side by side & compare their dust trails. I guess I'm also thinking about the tracks they leave in the dirt..... those big duals plow up a lot of dirt when they roll over it with all that weight. To me, that has to translate to much more dust in the wake.
Compare it to a motorcycle going the same speed, maybe. Of course, you'll say the motorcycle has a fraction of the frontal area, too..... Hmmmm - - can we somehow load 10 tons onto a motorcycle????? or reduce the weight of said semi truck to 1000 lbs???? Maybe a strict weight vs. frontal area test would be difficult.....
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