> Except, in the engineering sense, dealing with rough surfaces/potholes should absolutely be filed under "normal use". I never claimed otherwise. The enginee

> Except, in the engineering sense, dealing with rough surfaces/potholes should absolutely be filed under "normal use". I never claimed otherwise. The engineers' original model of function was faulty, and should've included rough surfaces/potholes. But since it (obviously) didn't, that makes rough surfaces/potholes an exceptional circumstance in the context of their model.