[Tagging] Motorway_junction = javbw confusion

Duane Gearhart duane at mapzen.com
Fri Jun 3 13:40:09 UTC 2016

Using the Common Japanese Junction.

I ran a route from the highway:

I ran a route to the highway

Do these instructions look correct? I am sure more interchange sign
information could be added to the data to give the user more information to
help with confusion. If there was mapillary at interchange I could add more
of the interchange information.
Apologies - I am just trying to understand what the issue is with respect
to user guidance confusion. (and I do not know Japanese)


On Wed, Jun 1, 2016 at 10:20 PM, John Willis <johnw at mac.com> wrote:

> Javbw
> On Jun 2, 2016, at 7:59 AM, Duane Gearhart <duane at mapzen.com> wrote:
> Can you give an example route using osm.org of where there is an issue?
> I will re-read the tagging pages to make sure I am not confused, but if a
> "motorway_junction" = exit, and there is no implicit tag for entrances,
> this works fine in most places because there is usually a entrance-exit
> pair for each direction of travel.
> I assume because the ways are connected with a shared node that routing
> software can tell where to turn and where to go, but since the junction is
> used as a rendered label of the intersection, that visually might be
> confusing if there is an exit/entrance only in one direction on the
> motorway or if there is an entrance only.
> In the freeway system of America, the entrances and exits will be 4
> separate motorway_links that separately leave a normal road to join the
> motorway, but that is not expected in Japan - a single entrance-exit
> intersection for all directions of travel is common - so having a separated
> entrance or a junction with an exit for only one direction of travel is
> rendered confusingly. I have also come across junctions with named sections
> (gate 1&2)  handling their own entrance and exit _links under the guise of
> being a single "junction".
> Common Japanese Junction.
> https://www.openstreetmap.org/#map=16/36.2414/138.8943
> Common US underpass Junction
> https://www.openstreetmap.org/#map=17/32.93673/-117.11117
> Orphaned US entrance.
> https://www.openstreetmap.org/#map=19/32.72472/-117.15108
> (This is for 163 north, entrance on the other side is for 5 south or 94
> west)
> Separated Japanese Junction (etc only, causes wrong way drivers because of
> separation)
> https://www.openstreetmap.org/#map=15/36.3073/139.0912
> Japanese Exit only southbound (C22). Entrance only northbound. (Orphaned
> exit & orphaned entrance)This was the junction that had me question why the
> entrance _link had a junction tag on it.
> The tollway is in a tunnel under the primary road.
> https://www.openstreetmap.org/#map=16/35.6639/139.6882
> Weird junction that has 2 "gates" that lead to different major roads to go
> to two different tourist attractions (Mt Fuji & Hakone Caldera) but all
> under the same junction name and reference (ref=7) instead of the normal
> separation of close junctions (ref=7 & ref=7-1)
> https://www.openstreetmap.org/#map=15/35.2952/138.9500
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