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 <o...@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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