[Tagging] How do you map traffic signals where right or left turns are allowed or not allowed on a red light?

Supaplex supaplex at riseup.net
Sun Oct 11 20:24:52 UTC 2020


Isn't it sufficient to use this red_turn-tagging at the traffic light
(instead of a turn relation), since it restricts to whom the traffic
light applies? General turning rules remain unaffected.

This tagging obviously comes from the German-speaking area (see also
TagInfo map), because there is the "green arrow" sign on some traffic
lights (originally invented in the GDR, later adopted in other countries
all over the world): It allows to turn right at red light. In China, the
same regulation applies as in the USA (turning at red light always
allowed unless other signing).

Alex

Am 11.10.20 um 18:11 schrieb Joseph Eisenberg:
> In North America (since we hate pedestrians) usually it is legal to turn
> right at a red light (we drive on the right side of the road, so a right
> turn only involves crossing into one lane).
>
> At some intersections where there are many pedestrians, there are signs
> that say "no turn on red", or sometimes "no turn on red except bicycles".
>
> Should this be mapped as a Relation:restriction? For example, a relation
> with "restriction=no_turn_on_red" + "except=bicycle"?
>
> Alternatively, I see there is a tag used in Europe in the form
> "red_turn:right:bicycle=yes" + "red_turn:right=no" - this would mean that
> bicycles may turn red at a traffic signal but other vehicles may not turn.
> This is documented at https://wiki.openstreetmap.org/wiki/Red_turn
>
> That tag is also used when right turns are allowed, e.g.
> "red_turn:left=yes", when this would not always be expected. It's most
> often used in Dresden.
>
> Oddly, it is proposed on the page that you could also use
> "red_turn:straight:bicycle=yes" to say that "bicycles are allowed to go
> straight at this traffic light when it is red", but this sounds very
> strange to me.
>
> I wonder if "red turn" is a translation from German or another language?
>
> -- Joseph Eisenberg
>
>
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