janjko at gmail.com
Mon Jun 12 09:34:27 UTC 2017
pon, 12. lip 2017. u 10:58 Martin Koppenhoefer <dieterdreist at gmail.com>
> 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.
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