[Tagging] The direction=* tag

yo paseopor yopaseopor at gmail.com
Sun Mar 19 19:55:03 UTC 2017

> yes, it is important to be able to understand to which way (and traveling
> direction) a sign applies, but nodes do not have a forward or backward
> direction

but the way the node is in yes it does. Node it is not independent. It is
in a way. with a specific direction (you can revert the direction if you
need it, rivers only flow forward-downward). Wiki says "(i.e., draw the way
in the direction that the river flows)."[1]

> , at most they can have an upwards or downwards direction. They also have
> a front side and a back side

, but generally I'd assume the tagging is about the front side, without
> specifying it.

In OSM mappers assume something until this thing has become more important
and then need to redefine the way the key is applied with subkeys and other
values.Think about bus stops for example [2] [3]...

> One way to map the direction in an easy way is to map the sign at the side
> of the road.(requires post processing to use the information in a graph
> model).

To avoid this complication I can assume the direction of the way the node
it is in. JOSM style recognise it, Kendzi3D plug-in also does with
direction key or :forward/:backward subkey. [4]

> For a stop sign you could also make a short way for the part from the stop
> line to the actual crossing node, and add stop sign information there
> (either with a relation similar to turn restrictions or with direction
> dependent tags on the _way_)

Why you accept a line and not a dot in the same place knowing the
information of the way the node it is [5]? Reading OSM wiki Why is possible
to do with traffic lights [6] (you have to put in a way - wiki says "Thus,
because traffic signals can affect routing decisions, it is important that
they are attached to the ways to which they apply, and not placed beside
the way" [5] , you have a specific subkey) or city_limit [7] but not with
the other traffic signs? Do we have to erase and delete all the traffic
signals (907 256) [8] because they are not correct? If we can do with a
traffic light I am sure we can do with other nodes with no lights there but
so important. If traffic signs were not so important governments did not
put in at the roads.

Mapillary and OSC will give us this information through their plug-ins.
Mapillary has a complete scheme of traffic signs recognition [9]. OSC has
an inside editor [10]. Spanish government open a file with more than
500,000 traffic signs relative to the way...and with a specific permission
to use it with OpenStreetMaps [11]. Are we telling other organizations can
give us this data, with this specific information but OSM can't accept it?
Taginfo says it is possible  [12][13]

Salut i senyals de trĂ nsit (Health and traffic signs )

[1] https://wiki.openstreetmap.org/wiki/Tag:waterway%3Driver
[2] https://wiki.openstreetmap.org/wiki/Tag:public_transport%3Dstop_position
[3] https://wiki.openstreetmap.org/w/index.php?title=Tag:
[4] https://wiki.openstreetmap.org/wiki/Proposed_features/
[5] https://wiki.openstreetmap.org/wiki/Tag:highway%3Dstop#How_to_map
[6] https://wiki.openstreetmap.org/wiki/Tag:highway%
[7] https://wiki.openstreetmap.org/wiki/Tag:traffic_sign%3Dcity_limit
[8] https://taginfo.openstreetmap.org/tags/?key=highway&
[9] https://www.mapillary.com/developer/api-documentation/#traffic-signs
[12] https://taginfo.openstreetmap.org/keys/traffic_sign%3Aforward
[13] https://taginfo.openstreetmap.org/keys/traffic_sign%3Abackward
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