<html><head></head><body>One reason it would be useful to be able to tag bridges (and, to a lesser extent, tunnels) as single physical objects is that they may be used as landmarks. For example, you may be traveling along a street that runs parallel to a river, looking for a location just past a certain bridge. If the renderer showed three bridges, for example, due to the tagging, but there is really just one bridge, you may end up going past your intended destination before realizing that the map didn't match reality.<br>
<br><br><div class="gmail_quote">Martin Koppenhoefer <dieterdreist@gmail.com> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail"><br /><br /><br /><br />On 05/giu/2013, at 11:30, François Lacombe <francois.lacombe@telecom-bretagne.eu> wrote:<br /><br /><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;">We don't need to create dedicated geometry for an highway tunnel since the geometry of the road gives the path followed by this tunnel.</blockquote><br /><br /><br />for Road tunnels this is mostly true, but if you look at caves or mines it is different. I was more pointing at bridges here anyway.<br /><br /><br /><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;">So we can precise it in the "role" attribute of the tunnel/bridge relation member which tube the road way represent. Since OSM doesn't manage relation member attributes at all, it will be difficult.</blockquote><br /><br />of course relations can have tags - it is up to the consumer to do sth
with them<br /><br />cheers,<br />Martin<br /><hr /><br />Tagging mailing list<br />Tagging@openstreetmap.org<br /><a href="http://lists.openstreetmap.org/listinfo/tagging">http://lists.openstreetmap.org/listinfo/tagging</a><br /></pre></blockquote></div><br>
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