I recall seeing a lightning talk at the 2016 State of the Map US in Seattle about mapping curb lines. Lou Huang gave a talk "Representing streets in OSM with Curblines" [1] which proposed mapping streets from curb to curb as polygons if I recall correctly. (Unfortunately I couldn't find a video of his talk.) His proposal overcomes some of the problems of mapping curb lines as a separate way. But the level of detail required to map as a polygon seems to be a real barrier to acceptance.
When I originally mapped sidewalks and footways in my small town, I added the sidewalk=left/right/both/no tag to the street. Having just gone back to actually map each sidewalk, having the information was helpful. But keeping two sets of basically identical sets of information doesn't make sense. If we add in a third linestring for the curb line, do we end up with three sets of similar info? Adding curb info to streets to me doesn't make much sense because streets are longer than the curb. Adding curb info to sidewalks won't help vehicle traffic where it's nice to know if there is a curb. The only logical option is to map curbs as independent ways even if it means we might have three sets of similar information. To develop a proposal on how to map sidewalks, curbs, and streets should be done before we jump in to import the data. Much like Nick and UW did with the proposal to map sidewalks as independent ways. I know cities collect curb information. Even my small town does. The data is there and if it's properly licensed, it could be useful in OSM. [1] https://2016.stateofthemap.us/project-lead/ Clifford -- @osm_seattle osm_seattle.snowandsnow.us OpenStreetMap: Maps with a human touch
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