We need to distinguish two questions, which were mixed up in the previous discussion, namely
a) should a centre line be mapped at all, b) if so, how should it be drawn and tagged. As for a), mapping certainly provides a value on a road with bidirectional traffic. We can map if it is a solid or dashed line, or if it is missing. For a dual carriageway, which is physically separated and therefore mapped as two separate ways in OSM, I see no value. However these were examples cited before, where highway=centreline was added to a physical barrier. So for b), the centre line needs to be an attribute of a linear highway, thus tagging highway=centreline does not work. It is also semantically wrong, since the line is not a highway, and adds a new feature to the historic elements in the highway valuespace that are not highways either (highway=traffic_light etc). Thus we would need a new key as follows: <new_centreline_key>=[single|double|dashed|etc] As the line might not always be in the centre, a better name would be welcome. The following existing tags need to be considered in this context: - turn:lanes[:forward|backward] - change:lanes[:forward|backward] - overtaking=* The proposal for Key:road_marking scares me, if we start mapping every dash of a line we will end with complete clutter. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
