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. :-)
My two cents: I must say that here in California, I've made it a
habit to remove the "County Route" designation (CR) which precedes a
ref number in our County Route system. For example, NE2 (a
banned-from-OSM former contributor for those unfamiliar with that
history) entered ref tags for many G2, N1... county routes as "CR G2"
and "CR N1." That, in my opinion, is so redundant (as G and N and A
and S... are well-known multi-county/regional-within-California
county highway networks) as to be true clutter. People in California
do know (and routing software, renderers... SHOULD know) that A1, G2,
N4 and S16 are county routes in a lettered system where each letter
represents a cluster of counties...at least in California.
Also, while "SR" (for "State Route" in California and other states)
is still legally correct, I still might change for consistency's sake
any "SR" prefix I see in a highway route relation ref tag to be "CA"
instead. So, while "SR 17" is correct, I much prefer "CA 17" and
will change it to that if I see SR in a California highway route
relation ref tag.
I agree with what we (as OSM volunteers entering/editing data in our
map) now do, as well as what map styles/renderers and routing engines
do, as Minh notes above: "recognize the state abbreviation, SR or
SH." Yes, Michigan still has its M- routes, and I think OSM (both
its human editors and software components) should just learn to cope
with that (plus perhaps a few other states) as exceptions to this
largely (though not completely) applicable rule. I believe we are
pretty much there, but we still have edge cases, data in the map and
newer contributors who are not completely familiar with these
conventions in the USA. Discussing it here helps, though wiki
documentation and taginfo data which are consistent across the fifty
states is better.
SteveA
California
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