[OSM-talk] "Incorrect speed limit" anonymous notes - who is behind that?

Peter Wendorff wendorff at uni-paderborn.de
Tue Jul 29 10:49:20 UTC 2014

there are QA tools to detect where speed limits are missing?
Can you give me a link?
And - if it's not self explaining: how should that work? I don't see any
way to detect missing speed limits in the data beyond cases where those
are implicit defaults, like 100 on non-trunk roads away from built up
areas in Germany (which is complicated enough to derive from the data),
or 130 for trunk roads (although most often there are lower limits), or
50 in cities (as the most often down-signed default).

So if there is any QA tool that detects that, I fear it uses third party
sources, a reporting system similar to the notes feature, but using a
different channel, or it is restricted to some cornercases only. I doubt
there is something like that which could make notes about speed limit
errors in osm obsolete.

IMHO notes are to be checked in person on the ground usually. If there's
nobody in France to do that, yes, then notes will remain in the database
for a long time, but basically they stay correct: Here is something
missing or wrong, please check that on the ground.


Am 29.07.2014 um 11:09 schrieb JB:
> I don't necessarily want to analyse once more how the notes are opened,
> closed or not closed and to what aim, nor analyse the end of
> OpenStreetBug life and the quality of the remaining bugs, but in France,
> I have never ever seen anyone comment on someone else's note (or «
> resurvey »). The only comments I have seen were from the note opener,
> when prompted by a potential corrector.
> So a note which indicates « probably 90km/h here » or « speed limit is
> not 0km/h » may remain there for years (yes, years), demotivate
> potential note closers, never be closed. I do not think they participate
> to a high quality note db. There are quality assessments tools around
> that allow contributors to detect where speed limits are missing.
> JB, with perhaps some bad faith in there, but not that much.
> Le 29/07/2014 10:19, Steve Doerr a écrit :
>> On 29/07/2014 08:32, JB wrote:
>>> Anyway, as for most notes concerning speed limits, if you do no have
>>> the beginning and the end of the limit, at least in France, the
>>> information is quite useless.
>> Are we all armchair mappers now? Surely the note should prompt someone
>> local to go out to the location and find out where the speed limit
>> starts and ends?
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