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Kirk, I did catch your drift, but re-reading my post makes it sound like I didn't. I realize you meant movement of 3".
I met a couple a little while back where the wife grew up in Germany. They told me about the apprentice program there, and how they have to dress a certain way signifying their apprenticeship (I think this was a carpenter or mason), and that they have to do a certain amount of work, and I think they had to do it inexpensively as well. In fact, maybe they didn't get paid for it at all.
Sounds charming.
As for those in the US - unfortunately, we don't have any flexible pavements to study that are that old. There are some that are 100 years old or more, and I've seen and photographed a few, but they are in pretty rough shape.
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