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

[Tobias Zwick]

Wow, this now is really helpful information! So good that you are on
this list, this is exactly the kind of thing I was seeking when posting
to here!
Some replies and notes:

1.
> It even more common to believe that Restricted Roads are not NSL
> roads. NSL Restricted Roads are a type of NSL road.

How does it matter though? What does the keyword "NSL" imply?

2. Also, what about dual carriageways (nsl_dual) that are lit? Will they
then also default to 30 mph if there is no explicit sign that indeed one
can go faster than that?

3. So, from the document, I understand an "LSL for individual roads"
would be "maxspeed:type=sign" translated to OSM while "LSL for zones"
would be "maxspeed:type=GB:zoneXX" translated to OSM.
I see in "OSM speak", we drop the "LSL" for these, but do not for the
"NSL" stuff. General question, not directed specifically to you: Isn't
that inconsistent?

4. I see you use "UK:something". I think to use "GB:something" has
somewhat established itself over UK by now, looking at taginfo. (Also,
the ISO-3166 of United Kingdom is GB)

5. I see you use "UK:zone_XX" instead of "UK:zoneXX". Also looking at
taginfo, I think that the latter somewhat established itself over the
former now: About 100,000 usages of XX:zoneYY, about 34,000 usages of
XX:zone:YY and about 0 usages of XX:zone_YY

---

By the way, offtopic this:
Do not assume though that the UK is the only country with unnecesary
complex maxspeed legislation. Look at this flow-chart created by Minh
Nguyễn after researching this for Ohio, US: :-D

https://wiki.openstreetmap.org/wiki/Ohio/Map_features#Speed_limits

Cheers
Tobias

On 01/05/2018 20:19, Jason Cunningham wrote:
> I had a bit of an interest in tagging speed limits a few years back.
> It's way more complicated than it should be in the UK. Researching led
> me down a bit of a rabbit hole of legislation & case law.
> 
> I made the following personal notes about UK limits and how to recognise
> them, which I think is mostly correct.
> https://wiki.openstreetmap.org/wiki/User:Jamicu/UK_Speed_Limits
> 
> I personally tagged restricted roads as  maxspeed:type=UK:nsl_restricted
> 
> All a bit of a mess though.
> 
> Jason
> 
> 
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