[Talk-us] [Talk-us-newyork] Highway classification guidelines for New York State

[Brian M. Sperlongano]

Thanks Jason, Kevin, and the NY mapping community for all the hard work
that's going into this!

Regarding:

There has always been a
> highway hierarchy with unclassified at the bottom rank, and then
> residential below that, ie, not ranked at all. Unclassified is for the
> most minor roads that link locations, residential is for public roads
> that don't. How these classifications are mapped to reality varies
> wildly over the globe (the names themselves are nearly meaningless) but
> the suggestion that we should choose between these two classifications
> by the *type* of traffic carried -- not by the role in linking
> locations, the amount of traffic, the distance covered, or the road's
> routing prominence -- seems like a sharp departure from tagging norms.


We had fairly extensive, and quite inconclusive discussions about whether
unclassified and residential are peers, or whether unclassified is "above"
residential in the hierarchy.  Certainly from a render perspective,
openstreetmap-carto and OpenMapTiles (the two I happen to be familiar with)
do not make any distinction between the two, rendering both of them
equally.  I've heard it noted that some routers do give unclassified less
of a router penalty than residential but more than tertiary.

In RI, I've been using unclassified for minor roads that don't qualify for
residential, service, or track, or tertiary.  For example, a minor road to
a dead-end industrial area.  The folks up in Vermont have been using it as
an intermediate level between residential and tertiary.  I don't think
there's really a right or wrong answer to this question, but it didn't seem
like from our discussions that it's something we have a consensus or
settled answer on.
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