[Tagging] How to tag way with two traffic signs affecting different directions?

[Jarek Piórkowski]

Phil, the question appears to be for different signs/rules for
different lanes/turns but in the same direction.

António, interesting question. In my interpretation, relation
type=enforcement seems to be intended for recording or punishing
violations of rules (wiki "devices that measure and document traffic
violations") - not for the restrictive rules themselves.

Instead, maybe type=restriction + restriction=stop, with
from-to-via-position? It's not widely used, but it does have a couple
of mappers: https://taginfo.openstreetmap.org/tags/restriction=stop

Possible examples:
https://www.openstreetmap.org/relation/3884744 except with "to" as a
way rather than node
https://www.openstreetmap.org/relation/2966044 except probably with
the to-way split at the intersection

traffic_sign:lanes looks like it would also work, and the existing
examples seem a bit more fleshed out than for restriction=stop -
depends if you prefer :lanes tags or relations, I suppose.

--Jarek


On Sat, 2 May 2020 at 14:36, Philip Barnes <phil at trigpoint.me.uk> wrote:
>
> Hi António
> Normally I would add direction:forward or direction:backward to a stop or give_way to indicate which direction it applies in.
>
> Where speed limits are different you can use maxspeed:backward and maxspeed:forward.
>
> Phil (trigpoint)
>
>
> On Sat, 2020-05-02 at 15:16 -0300, António Madeira wrote:
>
> Hi there.
> Following this topic, I would like to extend the discussion to the mail list, because I think this is an important issue that should have a broad solution.
> https://forum.openstreetmap.org/viewtopic.php?id=69011
>
>
> Several months ago, I stumbled upon a problem which I found no solution to. At the time, I searched for help in the Telegram channel and someone gave me a solution that I've been using since then.
> Meanwhile, another mapper contacted me in private and told me about another kind of solution to this problem.
> I would like to know if these are both valid and/or which one is more useful for routing.
>
> I'm showing here illustrations of the problem and the two solutions given.
>
>
> Problem #1:
> https://i.imgur.com/8MiiKFH.png
>
> The selected way has a STOP at the end for those who turn left and a give way sign for those who turn right.
> The "problem" is: how to map those two signs correctly and make them useful for routing software?
>
> Problem #2:
> https://i.imgur.com/cLFRtLG.png
>
> There are no painted islands and no physical divisions. The middle lane as a STOP sign to turn left.
>
> If you have
> lanes=3;
> lanes:forward=1;
> lanes:backward=2;
> turn:lanes:backward=left|through
>
> how do you indicate that there's a STOP on one of them?
>
>
>
>
> Solution #1:
> https://i.imgur.com/HDmvZiB.png
>
> Use both traffic signs on the way and create one enforcement relation for each of them. A "from" enforcement on the STOP and a "to" on the left segment of "Rua Paulo VI" and a "from" enforcement on the give way and a "to" on the right segment of "Rua Paulo VI".
>
>
> Solution #2:
> Just use the following tags:
> highway=secondary
> lanes=2
> oneway=yes
> name=Rua da Quinta
> ref=EN 350
> surface=asphalt
> traffic_sign:lanes=stop|give_way
> turn:lanes:forward=left|right
>
> I never used traffic_sign:lanes tag, but it seems legit, although Taginfo only shows 20 uses for this:
> https://taginfo.openstreetmap.org/search?q=traffic_sign%3Alanes
>
>
> Any considerations would be much appreciated.
>
> Regards.
>
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