[Tagging] Motorway_junction = javbw confusion

[Andrew Errington]

Yes, motorway_junction is for exit ramps only.  It is placed on the node on
the motorway where the exit ramp starts.

Motorway entrance could be implicit and detected by software planning a
route from a regular road to a motorway_link road through a toll booth.
The name of the toll both can represent the name of the entrance (in Korea
all toll booths are named with the interchange name).

You could propose a new tag, motorway_entrance, to be placed on the node on
the regular road where the motorway_link road starts?

Andrew

On 1 June 2016 at 08:41, John Willis <johnw at mac.com> wrote:

>
>
> On May 31, 2016, at 11:50 PM, Duane Gearhart <duane at mapzen.com> wrote:
>
> Also, you could add interchange information(destination* tag) on each way
> at the fork in the ramp:
> http://www.openstreetmap.org/way/59175151
> http://www.openstreetmap.org/way/285333466
>
> Examples from here may help:
> http://wiki.openstreetmap.org/wiki/Exit_Info
>
>
> Thanks for the links - and I will use that for one problem posted (adding
> info to the _link roads from toll plazas) - but the bigger question was
> about the motorway_junction being placed on exit nodes, and how that
> applies to entrance only junctions.  It seems motorway_junction is only for
> exit ramps, if I am reading it correctly.
>
> If we are using junction to just define the exit point on the motorway,
> There should be some tag for the entrance and exit nodes on the normal
> roads to define, in some complex situations, what entrance is named what
> without using just the ref tag, I think - similar to how a subway has
> entrance tags with their own ref and a separate station name with its own
> ref. Many junctions wouldn't need it, but complex junctions (and the
> motorways in Tokyo are insanely complex) might require additional
> information for helping a driver both visually and spatially match the
> map/navigation instructions to what they see in the real world, beyond a
> lane and when to turn, because in some places it is a confusing spaghetti
> mess and 50m makes a huge difference.
>
> Javbw.
>
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