[Tagging] Tagging long roads

M∡rtin Koppenhoefer dieterdreist at gmail.com
Thu Feb 17 10:31:23 GMT 2011

2011/2/16 Simone Saviolo <simone.saviolo at gmail.com>:
> Also, if a relation was defined that groups all the ways for that highway,
> you could select all the members of the relation - even beetter, you could
> move common tags (possibly name, ref, even highway) to the relation itself.

generally it is considered not to move the tags, but to copy them (at
least some time ago this was the suggestion). This is some redundancy
but will help keep the data more stable. There is still tools (and
mappers) that have problems with relations and if the only tag for a
road is on the relation and this road gets deleted from the relation
(or sometimes it happened in the past that all members were deleted
from a relation) the data breaks. Of cause this is a valid point for
all kind of relations, but roads are a very important feature for
routing (and roads beeing kept in relations are usually the more
important ones).

Please also consider for long roads (i.e. thousands of kilometers) to
make smaller relations and group them again with parent relations to
reduce the risk of conflicts.

> A slight OT: is there some agreed decision on how to solve conflicts in tags
> between a relation and its elements?

Yes, correct the wrong one with local knowledge ;-).


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