[Tagging] Destination tagging of motorway links

[Dave Swarthout]

Hi,

I need some help to resolve an impasse I've reached with an OSM mapper
about the proper tagging of destinations on motorway exit ramps. While
following a route on my Garmin GPS device, my turn off of the NYS Thruway
for Exit 49 was displayed as merely "49" (without the quotes). There was no
other destination shown despite plenty of signs indicating the exit was for
NY 78, Depew, Lockport, including the sign just prior to the exit ramp.

The original mapper tagged the exit ramps, i.e., the ways immediately after
the exit node (correctly tagged with ref=49, highway=motorway_junction)
with:
destination:ref=NY 78
destination=Depew;Lockport
highway=motorway_link
junction:ref=49
lanes=1
maxspeed:advisory=40 mph
oneway=yes
ref=49
surface=asphalt

IMO, all of these tags are correct except the ref=49 which I believe is
what's triggering my GPS to show "49" on its screen. I compile my own
Garmin-compatible maps and can change the interpretation of destination
tags if that is the correct tagging for exit ramps but I don't think it is
correct. That's why I'm raising the topic here. By the way, I used OSMAnd
on my phone to follow the same route and got the same result, the turn from
the Thruway at Exit 49 to reach Lockport was indicated by the two numbers
"49" (without the quotes). All the ramps in that intersection were tagged
with ref=49 by this mapper.

I don't do much expressway or motorway mapping so I wasn't sure if recent
changes had been made to the tagging scenarios for exit ramps but upon
reading the Wiki pages on motorway_junctions and exit ramp destination
tagging I cannot find any justification for tagging an exit with an
ordinary ref tag.This ramp does not have any ref associated with it and
Exit 49 is the only exit of the six or seven nearby interchanges I checked
that use this scenario.

I contacted the original mapper via a changeset comment but after scolding
me about tagging for the renderer, he justified his tagging and did not
offer to change it. IMO, simply removing the incorrect ref=49 tag from the
ramps in the intersection would solve the problem.

Opinions?


-- 
Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog: http://dswarthout.blogspot.com
Flickr: https://www.flickr.com/photos/184600884@N06
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