> On Jan 16, 2018, at 9:43 AM, Paul Johnson <ba...@ursamundi.org> wrote: > > > > On Jan 16, 2018 05:36, "Stefan Nagy" <stefan.n...@posteo.net > <mailto:stefan.n...@posteo.net>> wrote: > Am 16.01.2018 12:10 schrieb marc marc: > we probably need to work on "default values". > but no one seems motivated to work on the proposal. > > Is 'default values' a better word for what I called 'implicit values' > before or are you talking about something else? > > That's how I read it. Would be handy for situations that frequently come up, > like the speed limit of an area unless otherwise posted being a specific > value, or like U turns being blanket banned anywhere with a traffic light in > the City of Tulsa and State of Oregon.
I think I’ve seen the question of setting defaults come up several times on this list and never get traction. I personally think they’d be a good thing to simplify tagging. Just yesterday I felt obligated when putting a maxspeed tag on some residential streets resorted to also adding a source:maxspeed="California vehicle code 22352”. Paragraph 22352 in the California vehicle code indicates, among other things, that a unsigned a residential street has a 25 mph speed limit. It would be much easier and more encompassing to be able to add a tag to the boundary relation for California to indicate the default speeds for various highway classes in the state. Not a big deal for motorways as there are only a few tens of thousands of miles of those, but there has to millions of miles of residential roads in California with many (most?) being unsigned. But being unsigned won’t stop you from getting a ticket for exceeding the prima facia speed limit so routers and navigation guidance applications ought to know about it. I’d suggest something like default:* added to boundary relations. But that doesn’t really work for speed limits as you also need to specify the highway type. And I don’t see how that might work in your example of blanket prohibition of U turns. Maybe an interested small group could work off the tagging list to come up with a proposal on how jurisdictional defaults could be tagged. Once the worst of the defects in the scheme were fixed it could then be brought back to this list to be bike shedded to death.
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