[OSM-talk] Maximum recommended length of ways tagged with layer

Martin Koppenhoefer dieterdreist at gmail.com
Sun Mar 16 12:15:07 UTC 2014

2014-03-16 12:08 GMT+01:00 Richard Z. <ricoz.osm at gmail.com>:

> Working out every crossing that may happen to be bellow the
> long bridge and how it relates to the underground railway network down
> there is impractical.

I think you are exxagerating the problem, usually this is not very
complicated. Underground infrastructure will hard collide with any bridge,
as it should usually get tunnel and negative layer tags while the bridges
will have positive layer tags. If two bridges happen to intersect on the
same layer the more advanced editors will warn you about this.

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