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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