Bob La Londe wrote in
rec.crafts.metalworking on Fri, 12 Nov 2010 08:47:21 -0700:

From pure observation of roads maintained or not maintained by various local
public works and county maintenance departments. The roads that are flat
seem to hold up better (especially when not maintained at all) than the ones
that are crowned. I grew up in a rural area with dirt roads, farm roads,
and desert trails as our primary highways.

That explains it. Desert climate and desert dirt are worlds away from
what I'm working with.

--

Dan H.
northshore MA.