tag a complete way as bridge=yes (or bridge=swing, etc)
http://wiki.openstreetmap.org/wiki/Bridge
a number of LINZ: attributes to copy.
see wiki for how to merge these (tags) with already uploaded ways.

bridge_use1 mapping:
vehicle highway=road
farm highway=track
train railway=rail
tram railway=tram
cablecar railway=funicular
foot traffic highway=footway
stock highway=track
pipe man_made=pipeline
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Uploaded for Chathams 7 May 2010 (HB)