[Tagging] Long-distance scenic roads

Peter Budny peterb at gatech.edu
Thu Feb 24 04:03:03 GMT 2011

Nathan Edgars II <neroute2 at gmail.com> writes:

> In the US there are two long federally-maintained roads, the Blue
> Ridge Parkway and Natchez Trace Parkway, that were built for the sole
> purpose of sightseeing. Since they are surrounded by a narrow strip of
> parkland, access is only allowed at certain points, so they are
> technically expressways (normally trunk in the US). On the other hand,
> they are not intended in any way for utilitarian travel, and
> functionally fit approximately as secondary or tertiary.
> Tagging is thus inconsistent. It looks like the BRP was recently all
> changed to secondary, but the NTP has portions of residential (obvious
> BS) and primary. I'm pretty sure I've also seen trunk and tertiary
> used in the past.
> Does anyone have an opinion on how these should be handled?

My initial thought is to keep them as trunk and make sure speed limits
are tagged.  Maybe one demotion to primary is appropriate because of the
low speed.  Tagging speed limits explicitly will make sure that any
decent routing engine will avoid it.

My next thought is that I usually think of highway=* as meaning "How
important is this road, if you were describing things to a non-local
driver?"  In that view, secondary seems appropriate, because it's not
really relevant for general travel.  This also helps less-sophisticated
routing engines that don't have access to speed limit data.  I think
this is probably what I would go with.
Peter Budny  \
Georgia Tech  \
CS MS student  \

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