On 2014-11-29 22:45, Shawn K. Quinn wrote:
On Sat, 2014-11-29 at 22:21 -0800, Minh Nguyen wrote:
Do any routing engines currently care about prefixes on way refs?
From what I've seen so far, most of the map styles that use the ref tag
to distinguish route networks will recognize either the state
abbreviation, "SR", or "SH". Some renderers use the prefix to choose a
state-specific shield, assuming any unrecognized prefix is for a county
route (white rectangle at higher zoom levels). MapQuest only recognizes
state/provincial abbreviations. Not that we should place too much stock
in individual renderer decisions. :-)
OSRM doesn't know that, for example, TX 6 and SH 6 are the same highway.
Once upon a time, I'd get directions that had things in them like:
Turn right on TX 6
Continue on SH 6
Continue on TX 6
Continue on SH 6
Continue on TX 6 ... etc
Granted, OSRM still doesn't handle it gracefully when another highway
multiplexes for a stretch, but at least one might be able to figure out
which highway one's supposed to stay on when it's ref'd the same across
the board. When it's not, it becomes much trickier.
That's a good point: it is certainly important that an individual route
or road be tagged consistently, both its ref and (to the extent
possible) its name, so that routers and tools like Nominatim can
aggregate ways into roads.
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