[Tagging] tunnel=culvert

Dave Swarthout daveswarthout at gmail.com
Sun Oct 25 12:33:07 UTC 2015

I must comment here as I believe those two tags describe a situation quite
common in Alaska. Many many smaller waterways cross under a highway in a
special large diameter pipe called a culvert. The water flows through the
culvert, both are below the roadbed and consequently they do not share or
should not share any nodes. I map them using tunnel=culvert and the
additional tag of layer=-1. The situation is exactly analogous to when a
waterway flows under a bridge except in this case the bridge gets a layer=1
tag. A railway level crossing is quite different because the two ways do
cross on the same layer. Here tagging a node is correct.

I cannot think of a situation where one would tag a culvert as a node
unless it's to indicate an entrance to a very long, invisible culvert.

My 2 cents.

On Sun, Oct 25, 2015 at 7:12 PM, Georg Feddern <osm at bavarianmallet.de>

> Hello,
> Am 25.10.2015 um 11:44 schrieb Gerd Petermann:
> I do not fully agree here. In Germany, I often see a traffic sign
> "Vorsicht Düker"
> (~ "Attention! Culvert") next to these culverts.
> I am not sure why I should pay attention, but it seems that some
> people think that the traffic on the road should notify it.
> Maybe because it also often means that there is a
> barrier=fence along the road.
> In fact I thought that these signs are the explanation for the
> use of tunnel=culvert on a node.
> please be careful:
> A "Düker" is not a normal "culvert"!
> At a culvert the water is flowing on the same level in the culvert,
> normally with airy room above water level in the culvert.
> At a "Düker" the water is "pressured" on a level below the normal water
> level through the "Düker", so there is no room above water level.
> The normal road traffic has not to obey these sign - but any street work
> or use (crawling ;) ) at the waterside.
> Georg
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Dave Swarthout
Homer, Alaska
Chiang Mai, Thailand
Travel Blog at http://dswarthout.blogspot.com
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