[OSM-newbies] rivers, roads, and bridges ...

[Thomas Wood]

2008/10/30 Robert Helvie <alimamo at gmail.com>:
> Hi,
>
> There is a lot of blank canvas where I am mapping (South Korea) and I was
> just wondering about a few points.
>
> It is pretty obvious that you need to make a section of the way into a
> bridge if you have something like a road rising over train tracks, a road
> dipping below train tracks, one road rising or dipping over/under the other,
> flyovers, and actual bridges over major rivers.
>
> But is it really necessary (or at least what is the common practice) to
> create bridges for roads that cross minor rivers or streams with no rise, or
> where the water just passes under the road in a couple of box culverts?
>
> It is obvious on a render that a river and road don't connect, but is there
> some necessity for a bridge due to (future?) rendering conditions or
> possible routing software? Or would the use of the "layer" tag be good
> enough? (Though how to implement the layer tag is still a bit muddy to me.
> [Water related pun intended.] )
>
>
> Thanks
>
> alimamo (Robert)
>

The tag highway=bridge did exist at one time for use on nodes on
highways. It seems to have been deprecated in favour of bridge=<type>.
Note it should not be joined to the waterway, but placed 'over' it.

-- 
Regards,
Thomas Wood
(Edgemaster)