Greg Stark wrote: > Also, are ways actually entirely in one county or another? It seems to > me they would often span borders. > > That is how they are reported to the census bureau. Every county reports on the parts of roads that lie within its borders. They rarely match up exactly enough at the boundary for the import to be able to join them up. In some extreme cases, like roads along a ridge that is also the county border, every left turn is reported as a piece from county A, and every right turn as a piece from county B :)
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