This probably won't help routers much, but you could at least tag the positions of the signs as nodes on the highway with traffic_sign=GB:614 + direction=forward|backward
On 05/12/2020 14:27, Edward Bainton wrote: > 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, <[email protected] > <mailto:[email protected]>> 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 > <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 [email protected] https://lists.openstreetmap.org/listinfo/talk-gb
