>I don't know if the errors are intentional or accidental, but
>I do know that the USGS maps do have some errors in them. I
>have noticed on several maps that there were roads shown on
>the map that didn't really exist.

This is exactly the sort of thing they do. The Ordnance Survey in the UK do
exactly the same thing, and took the UK Automobile Association to court over
copyright by detecting exactly this sort of intentional "error".

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