<html><head></head><body><div>On Sun, 2017-12-10 at 18:25 +0000, Nick Bolten wrote:</div><blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid;padding-left:1ex"><div dir="ltr"><div>The downside of using `wheelchair=no` is that there are many conditions that will prevent some, but not all, wheelchair users from using the infrastructure. For example: some wheelchair users don't care about curb ramp info at all because they're comfortable finding driveways and going in the street (`kerb=raised` does not imply `wheelchair=no`), while others absolutely require proper infrastructure (most powered wheelchair users, `kerb=raised` implies `wheelchair=no`). I recommend tagging specific, on-the-ground conditions that can be interpreted later, like `kerb`, `barrier`, `width`, `surface`.</div><div><br></div><div>Another thing is that you probably want this info to be immediately useful, but I'm not aware of any existing routers that can use sidewalk=* subtags, as the sidewalk=* on a street model has to be expanded to a new graph (and the vast majority of routers don't do that). OpenTripPlanner is attempting to develop this, but it's unreleased. That doesn't mean you shouldn't tag, but it's a segue for my next recommendation: consider mapping sidewalks as separate footways. More or less, you describe sidewalks as `highway=footway` `footway=sidewalk`, connect them via `highway=footway` `footway=crossing` ways, and ensure that those crossings intersect and share a node with streets. While this involves more ways, it makes it much easier to organize and use the kinds of subtags you're interested in using, and can be used directly in most routers. For example, you wouldn't have to make an executive decision about `sidewalk:width` vs `width:sidewalk` - just use the widely-documented `width` tag.</div></div></blockquote><div><br></div><div><br></div><div>Mapping as separate ways can cause many issues, the basic rendering issue where streets already collide with buildings, plus where do I put the crossings other than make them up? </div><div><br></div><div>A pedestrian can cross the road anywhere and will not want a route that does not allow that most basic of concepts.</div><div><br></div><div>Phil (trigpoint)</div></body></html>