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

[Adam Snape]

The school lights I'm aware of which refer to a maximum speed are advisory
rather than mandatory. The actual legal speed limit remains the same.

Adam

On Wed, 2 May 2018, 11:17 Brian Prangle, <bprangle at gmail.com> wrote:

> Just to further complicate matters there can also be conditional 20 mph
> speed limits on roads passing schools, so they're default 30mph unless the
> condition is met when they're 20 mph  - condition is usually flashing
> lights during school opening and closing times
>
> Regards
>
> Brian
>
> On 1 May 2018 at 20:11, Tobias Zwick <osm at westnordost.de> wrote:
>
>> 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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>>
>>
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