[OSM-newbies] Bridges over canals - ref=**

Gregory Williams gregory.williams at purplegeodesoftware.co.uk
Sat Oct 17 18:43:11 BST 2009

The way that I identify the reference for bridges, as opposed to highways /
waterways, is to use a bridge relation and put the ref on there instead. It
then makes it unambiguous what the ref applies to. The same is true for
named bridges that are carrying a highway, etc. of a different name.

> -----Original Message-----
> From: newbies-bounces at openstreetmap.org [mailto:newbies-
> bounces at openstreetmap.org] On Behalf Of Nick Allen
> Sent: 17 October 2009 12:20
> To: newbies
> Subject: [OSM-newbies] Bridges over canals - ref=**
> Hi,
> I've been working on a section of canal in the UK, and have been adding
> bridges etc. I've researched the wiki thoroughly and as far as I can
> see
> bridge numbers (traditional way of knowing where you are on a canal),
> should be tagged using the ref=**.
> This is fine, but where a classified road crosses the canal two
> references result. This link shows the A426 crossing bridge 58 over the
> Oxford canal;
> http://www.openstreetmap.org/?lat=52.389392&lon=-
> 1.254384&zoom=18&layers=B000FTF
> As you can see, Mapnik has rendered this to show both references.
> If I'm getting the tagging right, will this cause problems for routing
> software for car drivers in the future  ... 'Follow the A426 for 12
> miles then cross bridge 58'.  Could make the M6 more interesting as I
> believe it crosses several canals.
> Am I getting this wrong, or;
> a/ does mapnik need an update, or
> b/ does an additional tag need to be used?
> Tallguy
> (aka Nick)
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