[Talk-us] georgia road classifications

[Chris Lawrence]

On Wed, Sep 9, 2009 at 3:28 AM, Kevin <ksamples at uga.edu> wrote:
> I thought I'd bring this to the list before I got too far along.  I'd
> like to class or reclass all the roads in Georgia according to the
> Highway Functional Classification System
> (http://www.fhwa.dot.gov/planning/fctoc.htm).  My source information is
> from the Georgia DOT
> (http://www.dot.state.ga.us/maps/Pages/HighwaySystem.aspx).  I've
> searched a little about road classifications in the archives and found
> one reference to this system
> (http://www.nabble.com/Road-classification-td21036868.html#a21040315)
> from December 08 and it seems to correspond to the United States
> proposed alternative in the wiki
> (http://wiki.openstreetmap.org/wiki/Highway).  What's the consensus or
> is there one?  Does anyone see a problem with this or have an objection?
>
> my crosswalk to osm would be... [clipped]

My biggest concern is that the functional classification system used
by FHWA and state DOTs will under-classify some roads; non-Interstate
freeways (e.g. GA 400, the US 78 Stone Mountain Freeway, etc.) are
classified as either "Urban Freeways and Expressways" or "Rural
Principal Arterials" yet are properly classified as highway:motorway
in OSM.

Also, I would be careful about automatically reclassifying any route
that someone has already manually reclassified.  At a minimum, that
would mean restricting automatic edits to tiger:reviewed=no ways,
although I probably would be even more conservative (only
reclassifying ways that were last edited by DaveHansen, e.g. as part
of the TIGER upload; or, alternatively, only reclassifying ways where
the current highway type is the same as the TIGER automatic remapping
- compare tiger:cfcc tags with highway tags).


Chris