[talk-au] Unclassified Highway Speeds
Dian Ågesson
me at diacritic.xyz
Wed Apr 20 04:55:22 UTC 2022
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
> <graemefitz1 at gmail.com> 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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>
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Links:
------
[1]
https://wiki.openstreetmap.org/wiki/Key:maxspeed#Implicit_maxspeed_values
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