[OSM-talk] How do you tag a traffic signal that's also amotorway junction?

[John F. Eldredge]

Nashville, Tennessee, USA has a ring road that is an odd cross between a motorway and an ordinary street.  Portions of Briley Parkway are a limited-access motorway, with high speeds and on/off ramps rather than intersections; other portions are ordinary surface streets, with traffic lights, and both residential and commercial driveways opening directly into the Parkway.  As you loop around the city, it changes back and forth between the two forms.  To further confuse matters, when it was constructed by joining together several existing streets, some of the streets kept their original names and some didn't.

-- 
John F. Eldredge -- john at jfeldredge.com
"Reserve your right to think, for even to think wrongly is better than not to think at all." -- Hypatia of Alexandria

-----Original Message-----
From: Richard Weait <richard at weait.com>
Date: Thu, 10 Jun 2010 18:45:25 
To: Nathan Edgars II<neroute2 at gmail.com>
Cc: <talk at openstreetmap.org>
Subject: Re: [OSM-talk] How do you tag a traffic signal that's also a
	motorway junction?

On Thu, Jun 10, 2010 at 4:10 PM, Nathan Edgars II <neroute2 at gmail.com> wrote:
> highway=motorway_junction with ref=[number] is used whenever there's
> an exit/junction number, whether or not it's actually on a motorway.
> But there are some numbered "exits" that are right at traffic signals,
> which should be tagged highway=traffic_signals. Examples include
> http://alpsroads.net/roads/nj/gsp/n10.jpg in south New Jersey (this
> one has a small separated "ramp" but another one doesn't),
> http://commons.wikimedia.org/wiki/File:NY_9A_north_exit_5.jpg in New
> York City, and http://gailmommers.50megs.com/pictmission/ny-17-exit-98.htm
> in upstate New York. How should these be tagged?
> highway=motorway_junction;traffic_signals?

Well it can't be highway=motorway_junction because motorways don't
have level crossings, right?

This image illustrates your question perfectly.
http://alpsroads.net/roads/nj/gsp/n10.jpg  Thank you for including it.

If this were a motorway_junction (it isn't) the exit number would be
in the ref tag on the exit node, so go with that.

I would tag the ways as usual, highway="secondary" or whatever is
appropriate here.

highway="traffic_signals"
ref="10B"

If that is indeed a flare for the right turn to 657 Eastbound, I might
mark the first node of the flare with the ref="10B"

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