[Tagging] The direction=* tag
nakaner at gmx.net
Thu Mar 16 10:38:23 UTC 2017
Am 2017-03-16 um 05:13 schrieb Tod Fitch:
> The “direction” tag  has different uses that seem disjoint to me.
> To specify the orientation (compass point or degrees from north) of an object (adit or cave entrance, etc.).
> To specify direction (clockwise/counterclockwise) around a roundabout (not sure why this is needed as it should be apparent from local laws or specified with a “oneway=yes”).
> To indicate the direction (forward/backward) a stop or yield (give way) sign has effect along a way.
> Oddly, that third use seems only for stop and yield signs but not for traffic signals where a “traffic_signals:direction=forward | backward” tag is to be used. However that seems to be the most used form . Apparently some have figured that if we have “traffic_signals:direction” there should be “stop:direction”  and “give_way:direction”  tags.
A direction tag is also used for railway signals, it's called
railway:signal=forward/backward/both. Both tags were used the first time
end of 2011 when the development of the current railway signal tagging
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