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Reply to "Rolling Tire Characteristics"

I'm having a little trouble with the asphalt vs. concrete arguments.

As we all have certainly observed, concrete can be finished in a number of different ways. Some of these promote traction for automobile tires, and they are the finishes we'll most likely see on road surfaces. Others do not and, I suspect, would offer less traction than typical asphalt.

But when we say "typical" asphalt, what do we mean? Asphalt pavement is laid with differing sizes of aggregate, and I suspect the friction properties differ among them. What if the asphalt is old and the aggregate is more exposed? What if the asphalt has been sealed? You don't see this much on roads, but you do in large parking lots. Is there sand in the sealer?

I think there is more than one variable here- and there may well be more unknowns than equations.
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