[GraphHopper] Suitable (for routing/turn-to-turn navigation) tagging for junction names and traffic signal names?

[Lukas Sommer]

Hello.

There are currently some efforts to get junction names and traffic signal
names rendered in openstreetmap-carto. The tagging for complex junctions
isn’t yet well defined. So I would like to hear your opinion and your
advice about which of our ideas would be suitable/best for
routing/turn-to-turn navigation.

Background:In some countries (Japan, Korea, Ivory Coast…) people orient
themselves in the local area using the names of road junctions (like
crossroads or roundabouts) or traffic signals rather then the names of
streets. While street names also exist, they are not important for
orientation. (Note: This is about orientation in the local area, thus
different from the names of motorway junctions who’s names serve for
orientation at large distances.)

Example: http://wiki.openstreetmap.org/wiki/File:Junction_yes_example_2.png

Possibility 1: A simple node in the middle of the junction. This node
contains the name of the junction. The node is not connected with any of
the ways.

Possibility 2: All shared nodes (of the crossing ways) contain the name of
the junction.

Possibility 3: A relation contains the name of the junction and has all
shared nodes (of the crossing ways) as members.

Possiblity 4: An area contains the name of the junction. The area covers
the outline of the physical area of the junction on the ground. The area
shares individual nodes with all incoming and outgoing ways. (In the
example: 8 shared nodes)

>From the point of view of a developer of routing/turn-to-turn navigation:
Which of theses solutions would be perfect, which would be still
acceptable, and which would be a no-go?

Lukas Sommer
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