[Tagging] Zone 30 (maxspeed)

[Sebastian Klein]

Hi,

there seems to be some inconsistency, how to tag a traffic zone with
maximum speed limited to 30 km/h (German "Tempo-30-Zone"). [1]

Tagwatch has the following tags for Europe (with maxspeed=30): [2]

usages tag
------ ---
944    zone:maxspeed=DE:30
631    zone:traffic=DE:30
516    source:maxspeed=traffic_zone
433    source:maxspeed=DE:zone30
152    zone:speed=30
140    maxspeed:zone=yes
 40    source:maxspeed=zone30

People have been very creative because there is no proposal or
definite suggestion on the wiki. The only one that is remotely
documented is the first from the list. [3]

Lets pick one and add it as tagging suggestion to the wiki pages
"Key:source:maxspeed" and "DE:Road_Signs"! [4,5]

So which one to choose? Certainly there is no reason to have more than
one tag for this.
On the one hand, the single most important reason to tag this, is to
have a source for the maxspeed value. This would suggest to use the
3rd or 4th.

On the other hand, the direct approach would be to tag what is
actually there (the traffic zone) and have source:maxspeed implied.
There could also be some legal implications, although for Germany, I
don't know anything relevant.

[1] http://fr.wikipedia.org/wiki/Zone_30
[2] http://tagwatch.stoecker.eu/Europe/En/tagstats_maxspeed_30.html
[3] <http://wiki.openstreetmap.org/wiki/Proposed_features/trafficzone#Zones_which_does_not_need_tagging>
[4] http://wiki.openstreetmap.org/wiki/Key:source:maxspeed
[5] http://wiki.openstreetmap.org/wiki/DE:Road_Signs


--
Sebastian