[Talk-ca] Two-way freeway tagging

[Adam Franco]

As a neighbor just south of the border I would suggest that there is value
in using the same highway=* classification of the rest of the roadway and
adding expressway=yes <https://wiki.openstreetmap.org/wiki/Key:expressway>
for enhanced two-directional roads. While there are enhanced interchanges,
these roads really aren't up to the same standards as something like the
A-20 near Montreal. Speeds are lower, lack of passing lanes, and other
features make these much less than highway=motorway in my understanding.
The usage of expressway=yes allows setting of expectations for an
intermediate level of infrastructure, something more robust than a common
road with much at-grade access, but also less than a full-on motorway.

The A-20 near Rimouski (osm
<https://www.openstreetmap.org/#map=12/48.4052/-68.5915>, americana
<https://zelonewolf.github.io/openstreetmap-americana/#map=12/48.4052/-68.5915>,
street view
<https://www.google.com/maps/@48.4052256,-68.5914828,3a,75y,71.48h,84.72t/data=!3m6!1e1!3m4!1s57x1f22rg7uLi2FCsQXlVw!2e0!7i16384!8i8192?entry=ttu>)
is a very similar structure to US-7 near me in Southern Vermont (osm
<https://www.openstreetmap.org/?#map=15/43.1636/-73.0281>, americana
<https://zelonewolf.github.io/openstreetmap-americana/#map=12.3/43.17506/-73.03172>,
street view
<https://www.google.com/maps/@43.1710771,-73.0351502,3a,75y,35.72h,80.42t/data=!3m7!1e1!3m5!1sIBrgrsAMdhNOALowj_3Vgg!2e0!6shttps:%2F%2Fstreetviewpixels-pa.googleapis.com%2Fv1%2Fthumbnail%3Fpanoid%3DIBrgrsAMdhNOALowj_3Vgg%26cb_client%3Dmaps_sv.tactile.gps%26w%3D203%26h%3D100%26yaw%3D141.33246%26pitch%3D0%26thumbfov%3D100!7i16384!8i8192?entry=ttu>)
which we've identified as highway=trunk (for connectivity importance) +
expressway=yes for infrastructure that is almost, but not quite up to our
interstate highway standards due to the lack of directional separation.
We've also been using expressway=yes for divided highways that have
narrow-radius exits, are missing shoulders, and are otherwise just not
quite up to motorway standards. For example, NY-5 (osm
<https://www.openstreetmap.org/#map=16/42.9135/-74.1201>, americana
<https://zelonewolf.github.io/openstreetmap-americana/#map=16.08/42.913339/-74.120837>,
street-view
<https://www.google.com/maps/@42.9129877,-74.1207551,3a,75y,285.73h,81.18t/data=!3m6!1e1!3m4!1sKzmwHqkvnsnNAcwhxoWfwg!2e0!7i16384!8i8192?entry=ttu>)
is tagged as highway=primary (for connectivity importance) + expressway=yes
as it is 4 lanes and divided, but has at-grade intersections which
disqualify it from highway=motorway. A second example is the Taconic State
Parkway (osm <https://www.openstreetmap.org/#map=15/41.7726/-73.7645>,
americana
<https://zelonewolf.github.io/openstreetmap-americana/#map=13.24/41.77874/-73.75413>,
street-view
<https://www.google.com/maps/@41.7732296,-73.7666582,3a,90y,328.23h,79.31t/data=!3m6!1e1!3m4!1s7Uf5IK79Wcb8xWlaj7DSCA!2e0!7i16384!8i8192?entry=ttu>)
which is divided and mostly has grade-separated interchanges, but shoulders
are narrow, speed limits low, some at-grade crossings, and interchanges
often have short-radius turns -- this is close to interstate highway
standards but not quite there, hence expressway=yes.

The only real exception for using highway=motorway on in the US for
something other than 4+ lanes, divided, and fully-controlled access is I-93
in Franconia notch (osm
<https://www.openstreetmap.org/?#map=13/44.1160/-71.6763>, americana
<https://zelonewolf.github.io/openstreetmap-americana/#map=13/44.116/-71.6763>,
street-view)
<https://www.google.com/maps/@44.1178478,-71.6822842,3a,75y,14.97h,78.31t/data=!3m6!1e1!3m4!1sWDuvbKo8DzG8817VnjuyCA!2e0!7i16384!8i8192?entry=ttu>
where the Interstate narrows down to 2-3 lanes, though even here there is
usually a physical divider rather than just paint dividing the directions.

Best,
Adam

On Thu, Apr 11, 2024 at 6:53 AM Daniel Bégin <jfd553 at hotmail.com> wrote:

> IMHO I would use motorway with oneway=no, as should be A-20 near Rimouski
> (not trunk).
>
> Get Outlook for Android <https://aka.ms/AAb9ysg>
> ------------------------------
> *From:* Jherome Miguel <jheromemiguel at gmail.com>
> *Sent:* Thursday, April 11, 2024 4:21:18 AM
> *To:* talk-ca at openstreetmap.org <talk-ca at openstreetmap.org>
> *Subject:* [Talk-ca] Two-way freeway tagging
>
> Should these be tagged as normal motorway with oneway=no (like with
> two-lane expressways common in rural parts of Japan), or use trunk with
> expressway=yes (as like what is being done south of the border)? Examples:
> part of Sudbury Bypass, Autoroute de l'Énergie, and the A-20 near Rimouski.
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