On Mon, 30 Apr 2012 00:29:52 Kytömaa Lauri wrote: > >Before that I added a point in the Open issues section about lanes=1.5 > >and modified the note at the end of the section Narrow road. As > > So, today I got a chance to revisit an unpaved residential road > I've tagged as lanes=1.5 in the distant past. Here's two > pictures of it (in one) > > Above, usual traffic drives almost in the center of the road, > as if it were lanes=1. > > Below, the car in picture has it's right side mirror almost > touching the fence, and there's 2.2 meters of the > carriageway free for oncoming traffic, 2.6-2.7 meters > of space to the fence on the other side of the road. > Oncoming cars can get past each other, so it's not > lanes=1. Yet all driveers will slow to a crawl, or at least > to a jogging speed, so IMO it can't be lanes=2, > either. > > http://i46.tinypic.com/2cfqivn.png > > Which value would people use for the lanes=*?
Sometimes the answer is "It doesn't matter." If you tagged it with lanes=1, but not oneway=yes, then it's clearly a bottleneck and should be avoided by routers. If you didn't tag lanes=* at all and you didn't have oneway=yes then my assumption would be lanes=2 (because it's not one way). Or you could tag it explicitly with lanes=2. Either way, map users would probably complain that it's too narrow for certain types of vehicle, so it should be re-tagged lanes=1. If you tagged the width then it wouldn't matter if it was lanes=1 or lanes=2 because we can see the overall width and use heuristics to decide if it's a slow road or 'normal' road. Furthermore, if it's classified as highway=residential that would be a hint that it's a narrow road not to be driven too fast. Any of these factors, either assumed, or explicit, should be used by a route planner to make this road unattractive for routing. It's very tempting to add explicit values for every tag, but I really think sometimes it just doesn't matter, and we can get the same meaning for combinations of other tags (even if the tags are absent). Best wishes, Andrew _______________________________________________ Tagging mailing list [email protected] http://lists.openstreetmap.org/listinfo/tagging
