Sorry I should have made clear Rather than seeking to capture a subjective jmt in the map, I'm trying to capture "no U-turn" signs that are shopping this long stretch, .
I agree a driver should use their discretion. Equally where it's actually prohibited do we want to capture that? On Sat, 5 Dec 2020, 12:57 David Woolley, <for...@david-woolley.me.uk> wrote: > On 05/12/2020 12:39, Edward Bainton wrote: > > Any established tagging system? > > > > The turn restriction wiki > > <https://wiki.openstreetmap.org/wiki/Relation:restriction> envisages > > turn restrictions at junctions only; my case is along the length of a > > major road (~3km). There's no barrier to prevent it, but presumably > > routing engines ought to know that route correction after a wrong turn > > will have to wait until the next roundabout. > > > > That's a subjective judgement, so would be tagging for the renderer. > The renderer (in this case a router) should be using some sort of > heuristic like only permitting U turns on residential or service roads, > and giving a heavy weighting to the use of formal junctions at the the > expense of distance travelled. A real human would consider actual > traffic levels and sight distances but they would be difficult to > capture on the map and time and season dependent. > > I think No U Turn signs tend only to be used where traffic volumes or > junction structures, might otherwise suggest U turns were acceptable. > > I don't think any driver (or autonomous vehicle) should be making U > Turns based solely on the instructions of an automated router. > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb >
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