http://wiki.openstreetmap.org/wiki/Key:route
connect to the ends of roads so routing still works
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RP: is there a way to create amenity=ferry_terminal at each end node?
http://wiki.openstreetmap.org/wiki/Tag:amenity%3Dferry_terminal
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HB: just one survived the dupe test, and it was a tiny little one which probably has nothing in the way of terminals to worry about. uploaded for the mainland 19 jan 2011 in changeset 7009751.
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SD: you can add amenity=ferry_terminal at each end node by selecting 'First and last nodes' as the option for 'Apply To' for the tag.