[Talk-GB] Implicit speed limits: What to tag in built-up areas?

[Jonathan]

Am I missing something? The 20 mph signs are the same as all speed restrictions signs are they not?

Jonathan
http://bigfatfrog67.me

From: Tobias Zwick
Sent: 01 May 2018 10:45
To: talk-gb at openstreetmap.org
Subject: Re: [Talk-GB] Implicit speed limits: What to tag in built-up areas?

This tag is not invented, it exists in other countries where slow zones
exist as well.
Also, there *is* something special about it, otherwise the sign would
not be different from a normal maxspeed sign, wouldn't it? (And the
wikipedia article wouldn't exist)
The special thing about it, is that the posted maxspeed is valid for the
whole zone, in other words, until the maxspeed zone is explicitly posted
to be over. No repeater signs on crossroads and not even for adjacent
streets.

Yes, there is a certain similarity with the "normal" 30 mph limit in the
UK, that is why I mentioned "maxspeed:type=GB:zone30" in my original
post. Remember that OSM is a worldwide project, as long as something is
not the same in the whole world, it is not "normal".

Tobias

On 01/05/2018 11:16, Philip Barnes wrote:
> I wouldn't invent a type tag, it's maxspeed = 20 mph because that's what
> the sign says. There is nothing special about these areas.
> 
> Phil (trigpoint) 
> 
> 
> On 1 May 2018 09:58:23 BST, Tobias Zwick <osm at westnordost.de> wrote:
> 
>     Regarding the 20mph zones
>     (see https://en.wikipedia.org/wiki/30_km/h_zone), analogous to other
>     countries where they exist, they would be tagged as maxspeed:type=GB:zone20.
> 
>     On 30/04/2018 20:57, Philip Barnes wrote:
> 
>         Whilst in theory there is an implicit 30mph when street lights are
>         present and there are no repeater signs indicating a higher
>         limit then
>         the speed limit is 30 mph. It has nothing to do with urban, the same
>         rule will apply on lit rural roads. These days it is complicated by
>         20mph limits which also have no repeaters.
> 
>         That is the theory, however in over 40 years of driving and even
>         longer
>         cycling I have never come across an unsigned 30mph limit. It is
>         always
>         signed as you enter the zone. Whilst it's useful for
>         confirmation whilst
>         driving, it is not really useful for mapping, you need to survey the
>         start points so that it can be split at the appropriate points.
> 
>         Phil (trigpoint)
> 
> 
>         On 30 April 2018 18:41:26 BST, Tobias Zwick <osm at westnordost.de>
>         wrote:
> 
>         Hi there
> 
>         On tagging implicit speed limits in the United Kingdom, the wiki
>         lists
>         the following values [1] for "maxspeed:type":
> 
>         GB:nsl_single (=60 mph), GB:nsl_dual (=70 mph) and GB:motorway
>         (=70 mph)
> 
>         I understand that the current legislation defines a road with
>         road-lighting as a built-up area in which a lower implicit speed
>         limit
>         of 30 mph applies. There is no mention of it in the wiki, no
>         GB:urban,
>         GB:lit, GB:zone30 or anything like that, so something should be
>         defined
>         and documented by (you,) the British OSM community.
> 
>         My question:
>         How to tag roads in which such an implicit speed limit for built-up
>         areas applies?
> 
>         The question is motivated by an issue report for StreetComplete [2]
> 
>         Cheers
>         Tobias
> 
>         [1]
>         https://wiki.openstreetmap.org/wiki/Speed_limits#Country_code.2Fcategory_conversion_table
> 
>         [2] https://github.com/westnordost/StreetComplete/issues/1037
> 
>         ------------------------------------------------------------------------
> 
> 
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> 
> 
>         -- 
>         Sent from my Android device with K-9 Mail. Please excuse my brevity.
> 
> 
> 
> -- 
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
> 
> 
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