On Sun, 21 May 2017 22:23:12 +0900 John Willis <jo...@mac.com> wrote: > > Warning signs - not restriction signs - such as stop ahead, curve > ahead, falling rock, animals, etc do present a chance for the > presence of the sign's node to offer a notice to whatever is parsing > the way Data and present that to the driver/user when in proximity to > said warning. > > "Stop ahead" signs in Japan are really strong in some places > because perpendicular roads meet in rice fields where people may be > used to being on the road with others stopping for them. Having the > mapped sign *could* be beneficial to a way because the warning is > usually for that spot. > > https://www.flickr.com/photos/javbw/11091338426/in/album-72157638113676925/ > > (To-ma-re, like putting S-T-O-P on 4 signs before the triangle-shaped > stop sign) > > But even that could be a property of the way rather than inferred by > the point proximity of the sign (because I assume the sign node will > be placed with precision not where it is actually located, rather > than on road's way, because this is micromapping, after all)
This use of warning signs runs into the problem that data consumers don't have a good way of figuring out which signs go with which directions of which roads. Yes, the 90% solution is to say "the sign is associated with the road it is closest to, and the direction of travel corresponding to the side of the road it is on", but there are exceptions, both common and unusual. Probably the most common exception in the United States is "no passing" signs (a common pattern is to have the sign on *both* sides of the road, so that someone in the process of passing a large truck will still see it), and the second-most-common is advisory speed limit signs placed on the outside of the corresponding curve. Various clarification signs in close proximity to confusing intersections would have issues with "which road" rather than "which direction". Warning signs are something that data consumers could certainly make use of, but we need some way of explicitly coding which direction of which road they apply to. -- Mark _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
