[Tagging] Turn lane indications vs turn restrictions

[Paul Johnson]

On Sun, May 29, 2022 at 10:32 AM Mateusz Konieczny via Tagging <
tagging at openstreetmap.org> wrote:

> (1)
> Let say that we have crossing with lane with following signage:
>
> - left arrow on left lane
> - straight arrow forward on center lane
> - straight arrow forward on right lane
>
> You are nevertheless allowed to also turn right from the right lane.
> And make also u-turns from the left lane.
>
> How turn:lanes should be tagged in this case?
> I am asking as https://wiki.openstreetmap.org/wiki/Key:turn seems to
> be suggesting that actual allowed turns should be ignored
> and only what is signed matters and want to confirm this.
>

Use best judgement.  Tag what the lanes actually do.  There's decent major
chunks of pretty much every country's highway system where there are lanes
but they're not signed and while the lanes are painted, what they
explicitly do isn't.  I'd still explicitly tag what humans can see
implicitly within context, for the same reasons why we don't abbreviate
names; computers tend to need the context spelled out for them to give
effective results.
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