[Tagging] maxspeed:type vs source:maxspeed // StreetComplete

Tobias Zwick osm at westnordost.de
Wed Sep 19 19:16:52 UTC 2018


This is a good argument against tagging an explicit maxspeed=X when
there is actually no speed limit sign around (X is what the OSM mapper
by his knowledge about the law thinks should be the default limit here).

Unfortunately, this is still common practice because of the lack of a
scheme for tagging explicitly that the maxspeed is not signed.


On 19/09/2018 09:47, Philip Barnes wrote:
> And if the default actually applies, or has it been overriden by local
> signage.
> 
> I am not convinced that a default limit helps, if no speed limit has
> been surveyed I would prefer that box not to be displayed in my app.
> a. It will not give me wrong and possibly costly information.
> b. It makes it obvious that I should survey and map the limit.
> 
> Phil (trigpoint)
> 
> On 19 September 2018 07:10:27 BST, Graeme Fitzpatrick
> <graemefitz1 at gmail.com> wrote:
> 
> 
> 
>     On Wed, 19 Sep 2018 at 13:30, Joseph Eisenberg
>     <joseph.eisenberg at gmail.com <mailto:joseph.eisenberg at gmail.com>> wrote:
> 
>         So on the boundary=administrative admin_level=6 for Rogers
>         County, we could have something like maxspeed:type:default=45mph
> 
> 
>     Just after crossing over the border into the state of Queensland,
>     you have this
>     sign: https://www.google.com/maps/@-28.1592952,153.4932922,3a,75y,288.32h,90t/data=!3m6!1e1!3m4!1sXT0hBPanAoGnfz9N-Ugbyw!2e0!7i13312!8i6656
>     <https://www.google.com/maps/@-28.1592952,153.4932922,3a,75y,288.32h,90t/data=%213m6%211e1%213m4%211sXT0hBPanAoGnfz9N-Ugbyw%212e0%217i13312%218i6656>
>     (Incidentally, I think 7 of the 8 Australian states & territories
>     have the same limits?)
> 
>     I understand (I think!) that your system would set this as a default
>     for all Qld roads?
> 
>     But based on what? How does OSM know that this stretch of road is in
>     either a rural or a built-up area?
>      
>     Thanks
> 
>     Graeme
> 
> 
> -- 
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
> 
> 
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