Hello OSM Tagging, I have a question about the use of detailed lane geometry to OpenStreetMap, like (1) lane centerlines, or (2) lane boundaries, (3) variable lane width, or (4) lane connectivity.
Currently, all I see are: *(1) how many marked lanes are there on a highway, e.g. <tag k="lanes" v="4"/>* *(2) which lanes on a two way road are not distributed evenly between the driving directions <tag k="lanes:forward" v="3"/>, <tag k="lanes:backward" v="1"/>* *(3) the "turn=*" key, specifying the indicated direction in which a way or a lane will lead for turning or merging, e.g. <tag k="turn:lanes" v="reverse|through|through;right|right"/> <tag k="turn:lanes" v="left|left||||right"/>* *(4) uniform lane width* *width:lanes, width:lanes:forward, width:lanes:backward, maxwidth:lanes, width:lanes:both_ways* It seems like we would need a "Way" to describe each lane's centerline. My understanding is that it is not permitted in OSM to add an extra "Way" tag to a specific lane tag currently. Is this correct? I have heard from another user that the lane centerline model was the previous OSM model, but was scrapped and replaced with the current road centerline model. Also, another question I have -- would a line width have to be uniform across an entire "Way," or can different line widths be expressed for each separate chunk of the Way? I saw that there is a key that a few people have used: width:lanes:end <https://taginfo.openstreetmap.org/search?q=width%3Alanes> and width:lanes:start <https://taginfo.openstreetmap.org/keys/width%3Alanes%3Aend>. I did not see these in the OSM documentation. Are these just fields that people decided to add without approval? Shouldn't the OSM server reject such an upload? I saw that a proposed feature is street area <https://wiki.openstreetmap.org/wiki/Proposed_features/Street_area> (or similarly area:highway), where a Way would depict the polygon area of a street, but I'm interested in even more informative lane geometry than this. My understanding, is that this proposed feature will only allow the enumeration of drivable road areas, and not per-lane width/boundaries. There is a figure shown here <https://wiki.openstreetmap.org/wiki/File:StreetsLogicalLevel.JPG>. Thank you in advance for your time. Best wishes, John
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