On 15/08/12 06:49, Ben Johnson wrote:
It's part of a traffic zone proposal. It derives values based on the
country and type of zone. It looks like it can be an effective way
to define an entire set of tags that should apply consistently
across a group of ways (eg a method for all ways in a defined
"built-up" area to share a common set of key/values including
maxspeed, and other rules).
http://wiki.openstreetmap.org/wiki/Proposed_features/trafficzone#Examples
and bottom of
http://wiki.openstreetmap.org/wiki/OSM_tags_for_routing/Maxspeed#Implicit_maxspeeds_set_by_.22trafficzone.22_and_.22highway.22
I guess the danger with this again is presumptions!!!
Interesting. But it's only a proposal at this stage. For the time
being, I'd argue for adherence for the existing maxspeed tag value types
at http://wiki.openstreetmap.org/wiki/Key:maxspeed
John
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