[Talk-us] US Trunk road tagging

[Zeke Farwell]

Thank you, Minh, for the in depth discussion of all the interconnected
issues with highway classification.  There is definitely a lot to consider
and I think your assertion "that this isn't a simple
matter conducive to simple solutions" bears repeating.

As a fellow Vermonter, I agree with Adam's assessment of the NHS in our
state.  It seems like quite a good basis for the higher level OSM
classifications here.  However, I'm not surprised to hear that there is
significant variation and in some states it may be much less useful.  It
seems to me that a matrix taking both the highway system (Interstate, US,
state, etc) and the FHWA functional class into account would at least be a
good starting point in the decision tree for how a road should be
classified in OSM.  Waze has something like this in their classification
guide: https://wazeopedia.waze.com/wiki/USA/Road_types#Quick_reference_chart
I took a stab at creating a similar chart for OSM classification here:
https://docs.google.com/spreadsheets/d/1UQpA8pDqiJ6HL3Z96zmjSNAg9CVwEYxJiZnSj4KA5wI
I'd be interested to hear what people think of this approach.  I'm sure it
would need to be adjusted and made more detailed.  I would also only
consider a chart like this an initial guideline to allow for edge cases and
exceptions where roads could be upgraded or downgraded as appropriate.
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