A 20 mph zone is a 20mph speed limit area. 20 mph repeater signs are judged not to be necessary because the traffic calming measures physically limit the speed of traffic.
A 20 mph limit simply imposed on an existing road without traffic calming is deemed to require repeaters to differentiate it from a 30mph road. On Wed, 2 May 2018, 11:54 Jez Nicholson, <jez.nichol...@gmail.com> wrote: > Oh, this is fun. So, correct me if i'm wrong: a "20 mph zone" doesn't > have/need repeaters because it is not actually the legal speed limit. It is > advisory to travel at that speed because traffic calming makes it hard not > to. > > On Wed, 2 May 2018 at 11:36 Adam Snape <adam.c.sn...@gmail.com> wrote: > >> 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, <bpran...@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 <o...@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 >>>> > >>>> > >>>> > _______________________________________________ >>>> > Talk-GB mailing list >>>> > Talk-GB@openstreetmap.org >>>> > https://lists.openstreetmap.org/listinfo/talk-gb >>>> > >>>> >>>> >>>> _______________________________________________ >>>> Talk-GB mailing list >>>> Talk-GB@openstreetmap.org >>>> https://lists.openstreetmap.org/listinfo/talk-gb >>>> >>> >>> _______________________________________________ >>> Talk-GB mailing list >>> Talk-GB@openstreetmap.org >>> https://lists.openstreetmap.org/listinfo/talk-gb >>> >> _______________________________________________ >> Talk-GB mailing list >> Talk-GB@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/talk-gb >> > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb >
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