[Tagging] Underground power lines in tunnel

[François Lacombe]

Hi,

I'm currently improving draft of power transmission refinement proposal and
a question about underground features can't currently find answer.
http://wiki.openstreetmap.org/wiki/Proposed_features/Power_transmission_refinement

I wonder how we can map power lines underground and infrastructure which
can host them simultaneously.
The best example is when several power lines are built in a tunnel like on
this photo :
http://www.rte-france.com/webapp/100ansparis/img/chapitre3/img14.jpg

I can create several ways, very close from each other, for all power lines
we can see and tag them with tunnel=yes but how will I map the tunnel ?
If we only use tunnel=yes on each power line, it's impossible to know if
they are in the same tunnel or if there is one dedicated tunnel for each.

I think only a relation would solve the problem and it's not a power line
dedicated question.

Do someone have ever encounter that situation ?


Many thanks in advance, cheers.


*François Lacombe*

francois dot lacombe At telecom-bretagne dot eu
http://www.infos-reseaux.com
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