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

[António Madeira]

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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