[Tagging] lanes=3 + lanes:forward/backward=1 for "semi-divided" roads?

Mark Wagner mark+osm at carnildo.com
Sun Feb 12 20:56:50 UTC 2017

On Sat, 11 Feb 2017 23:39:00 -0500
Albert Pundt <roadsguy99 at gmail.com> wrote:

> Consider High Street in downtown Carlisle, PA. It is one lane each
> way, with a wide space as wide as a travel lane in the middle, but
> not used for anything such as a center turning lane. Tagging this
> with just lanes=2 seems wrong since it fails to take into account the
> lane width separating the two travel lanes, and since there is no
> raised physical divider, it doesn't seem right to mark it as a
> dual-carriageway road either. I've seen lanes=3 used along with
> lanes:forward=1 and lanes:backward=1, but that seems like it might be
> confusing.
> What, if anything, is the proper way to tag roads like this?

I'd consider mapping it as a dual carriageway.  I don't know what the
law is in Pennsylvania, but here in Idaho, a doubled double-yellow
line is the legal equivalent of a physical barrier: you are not allowed
to drive across it for any reason.


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