2018-05-22 17:18 GMT+02:00 Tod Fitch <t...@fitchdesign.com>: > In reviewing the wiki in preparation to fixing some of my older mapping, > it seems there is an inconsistency in how to tag a road that is wide enough > to two lanes of traffic but is lacking lane striping. > > In the lanes description [1] it says "the lanes=* key should be used to > specify the total number of marked lanes of a road." But in the out of town > highway tagging sample page [2] with a photo described as "smaller road, > maybe tertiary with appropriate administrative status" it shows a lane > count on a road with no markings. > > Am I correct in believing that the example photo should have its tagging > changed, dropping the lanes=2 and adding a width tag (if the width is known > or can be reasonably estimated)? >
>From practise in my area I would think we should drop the requirement of road markings and leave more freedom to the mapper. If a road is wide enough for 2 lanes and traffic is using 2 lanes, but there are no road markings, or currently no road markings, or mostly no road markings, I would still tag allow to tag 2 lanes. We could add a tag about road markings, or maybe absence of road markings. I'm unsure whether to differentiate absence of road markings because they are not deemed necessary from absence where they once were there but are not visible any more and someday might return. For example on a typical provincial country road with clearly 2 lanes there will often be no markings. (IMHO lanes=2 as it would be implied also when not setting a lanes tag), while in another case the situation is more ambiguous. This is a primary with a wide dual-carriageway, where 2 cars sometimes fit, while sometimes would require the slower driver to drive on the shoulder (what actually happens) so the other can overtake. I would be reluctant to tag these roads with 1.5-2 lanes (unmarked) as lanes=2 (in OSM it is indeed one lane). references, case A: https://www.openstreetmap.org/way/487717815 case B: https://www.openstreetmap.org/way/90537120 if you pay attention on google you can see how it is used as 2 lanes and even a car surpass: https://www.google.it/maps/@41.392393,13.0069698,167m/data=!3m1!1e3 We've also seen the example of the residential area in Australia where only the intersections had road markings. > > My current interest is in fixing the tagging for residential roads that > are wide enough for bi-directional traffic with legal parallel parking but > have no markings on the pavement. I don't see a exact match to that in > either the urban [3] or rural highway [2] tagging example pages. > > To use the street I live on as an example, am I correct that a residential > road with bidirectional traffic and parallel parking with no markings > should be tagged as: > > highway=residential > surface=asphalt > parking:lane:both=parallel > width=40’0" > maxspeed=25 mph > > to me this seems lanes=2 > If, and only if, a center strip is added then lanes=2 should be added. (I > actually measured the width in this case but for hope to be able to use the > measurement tool on aerial imagery in JOSM for most cases). > > Is my current understanding correct? it is the literal reading of the lanes tag description, but as you pointed out, it conflicts with other parts of the wiki. And if you don't add a lanes tag, the common default is lanes=2. What do you think about a new tag for the absence of road markings? Cheers, Martin
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