[Tagging] Tunnels and bridges

Kytömaa Lauri lauri.kytomaa at aalto.fi
Fri Feb 1 18:58:16 GMT 2013

>By "consumer", we all think about "renderer" (which is in my knowledge
>the only consumer looking for bridges in OSM atm). If you keep the
>"bridge" tag on the multiple highways, it is duplicating the

I believe there's no obvious reason not to think that bridge=yes
on a highway could be said to mean "is on a bridge" (attribute),
and not "this is a bridge (and a highway)" (object). Then, it's 
no longer duplicate information. So far the tools have just 
deduced that there must be the (undrawn) bridge along
the road, and would continue to do so if they do not bother 
themselves with the exact shape of the bridge deck.


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