[Tagging] Ferry lines, ways or relations?

[Janko Mihelić]

How do we address durations[1] of ferry lines? It can't be tagged on the
way, because different ferry lines have different speeds. And you can't put
it on the relation, because one relation can represent several different
trips, from island to island.

Is the solution to make a separate relation for every trip from a terminal
to a terminal, and then put them in a master relation? That would seem
similar to the new public transport proposal[2].

[1] http://wiki.openstreetmap.org/wiki/Key:duration
[2] http://wiki.openstreetmap.org/wiki/Proposed_features/Public_Transport

Janko
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