pon, 12. lip 2017. u 10:58 Martin Koppenhoefer <dieterdre...@gmail.com> napisao je:
> A question might be in some cases whether they are one tunnel with distant > tubes, or 2 tunnels "which happen to have the same name", because unlike > the carriageways on a bridge, every tunnel tube is a distinct structure, > and sometimes different directions can be quite far away and have different > shape (i.e. they are not parallel). > But they often have little connecting tunnels for emergencies and servicing, so in a way, you can say it's the same tunnel. The problem is, its hard to map underground connecting tunnels. Janko
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