[Tagging] lanes tag dispute

Anthony osm at inbox.org
Sun Sep 18 19:23:05 BST 2011

On Sun, Sep 18, 2011 at 2:19 PM, Toby Murray <toby.murray at gmail.com> wrote:
> My take on lanes is that it should be the number of continuous lanes
> along a road. This impacts traffic flow and road capacity which allows
> routers to make more informed decisions. Turning lanes don't increase
> overall road capacity. Rather, they prevent it from dropping at busy
> intersections. As such, I do not split and tag ways where turning
> lanes are. I could see turning lanes being useful information though
> but lumping them in with the total lane count actually obscures
> information. I would rather see them tagged with lanes:turning:left=1
> or something like that. That way you know exactly what is happening
> and routers could easily say "get in the left turning lane.

I'm fine with that if we can be consistent.  But that means
http://g.co/maps/4j2uh is tagged as lanes=0, lanes:turning:left=2,

It might be safer to to use lanes:through=X if you only want to
include through lanes.

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