Dave F. writes:
 > I live in the UK. How can I possibly know if there's genuinely a "sharp 
 > angle" in Arizona

You seem not to understand the problem being solved here (but please
clarify if I am guessing wrong). I haven't looked much at other
states, but in New York State, some counties (about 12) were badly
digitized. The roads mostly have the right names but are badly aligned
in a characteristic way. I've checked these using surveys, and the
aerial photos are right, and the OSM (actually TIGER) data is
bad. Once you've edited a few hundred of these ways, you learn to
recognize one of these mis-digitized ways.

THAT is how you can possibly know that there's genuinely a "sharp
angle" in Arizona.

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