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

[Tobias Zwick]

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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