Hey Andrew,
I'm chiming in as I encountered this issue documenting the "cleaned up"
Roads tagging guidelines.
(https://wiki.openstreetmap.org/wiki/Australian_Tagging_Guidelines/Roads)
The tagging guidelines (both prior to, and following cleanup) state it
is good practice in Australia to tag every road with a maxspeed.
The early guidelines say that the implicit speed limits have not been
widely adopted in Australia, but this no longer appears to be true.
In use is both the maxspeed:type tag and source:maxspeed tag.
Unfortunately, the earlier guidelines offers advice on the usage of the
source:maxspeed tag that is contradictory to the global page. (It
suggests local_knowledge to mark implicit speed limits rather than
AU:urban). The maxspeed:type tag does not have this contradiction.
I am not sure if leaving the maxspeed blank (or using a non-numeric
value) would be a good idea; using a non numeric value in maxspeed seems
to be much less preferred globally than the alternative methods. I
documented maxspeed:type rather than source:maxspeed following a discord
discussion, but I believe either of those two schemes are preferable to
using maxspeed=AU:urban.
Dian
On 2022-04-20 13:45, Andrew Hughes wrote:
Hi All,
First, I thought the tagging guidelines were "don't tag unless it's a
non-default value" (my language to describe this might be inaccurate,
feel free to improve). If this is true, then I shouldn't tag rural ALL
roads with maxspeed. It's only those that are "non-default".
Can anyone please confirm the above please?
Secondly, it does look like there is a tagging for implicit (speed)
values as per
https://wiki.openstreetmap.org/wiki/Key:maxspeed#Implicit_maxspeed_values
[1]
maxspeed = AU:urban
maxspeed = AU:rural
I believe that the above is better than tagging 50kph, 60kph or 100kph
- because a change in legislation (as has happened in the past) can
change is without tags needing to be updated.
But that all being said, I would still be tagging all roads and not
just those that are "non-default" on the ground. Which contradicts the
first point (if it is true that is).
This feels like a distinct gap in OSM (as others have pointed out). But
this is one I would like to know how to deal with.
Perhaps area's could be tagged with maxspeed=AU:urban or
maxspeed=AU:rural to define "implicit speed areas"? I think this might
be what is missing. Thoughts?
Thanks for reading
AH
On Wed, 20 Apr 2022 at 10:30, Graeme Fitzpatrick
<[email protected]> wrote:
In regard to defaults, the default 50kph Qld (Oz-wide?) urban
residential limit should apply around here, & sure enough, most
streets are 50. But we also have some residential streets posted as
40, 60 & 70, as well as 40 conditional school zones.
So I assume (using that terrible word! :-)) that actually tagging a
speed limit on a road overrides the default?
& while I've seen reference to Default Qld Residential speed limit on
the map, I've also noticed while driving around that OSMAND isn't
showing a speed limit?
Thanks
Graeme
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Links:
------
[1]
https://wiki.openstreetmap.org/wiki/Key:maxspeed#Implicit_maxspeed_values_______________________________________________
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