On Tue, 2015-11-24 at 16:51 -0800, Clifford Snow wrote: > > On Tue, Nov 24, 2015 at 4:14 PM, Philip Barnes <p...@trigpoint.me.uk> > wrote: > > They are not matching reality, can cause long detours and poor > > routing > > unless the mapper provides a lot of connections to the road. > > Remember > > normal pedestrians can cross wherever they want. > > > That is true, but what we want to give someone in a wheelchair is a > route that they can safely take. So at a minimum, the way must be > connect, where appropriate, at intersections and other recognized > crossings. A recognized crossing would be one with markings for > pedestrians or from local knowledge, that it is safe to cross the > street. Outside of areas with heavy traffic on main roads or with high numbers of pedestrians marked crossings do not exist, pedestrians normally cross wherever they need to, obviously avoiding danger spots such as blind corners.
Wheelchair routing would need to used sloped curbs, in most cases in a residential area these will be driveways. > > > > > > > > There is also the simple rendering issue, roads are already wide > > and > > are very close or clipping buildings. The sidewalk if mapped in > > position is likely to be hidden under the road. > > > I'm hoping that a wheelchair map would draw the sidewalks and > minimize the streets. That is a rendering issue. As we like to say, > don't map for the renderer. You are proposing to change the database, other maps will be affected too. If a separate footway is drawn, it will render alongside the road on the default style, which will be misleading as there is not a separate way. > > > > > > Setting aside the newbie friendly issue, how do you map a > > crosswalk > > > in the middle of a street? > > Add a node where the drop kerb is and map which side it belongs to. > > > If I understand correctly, at a street crossing, the tags would be > > highway=crossing > kerb:(left/right/both)=lowered I would have thought only marked crossings should be tagged in this way, otherwise they are just the mappers opinion. > > > > > > > How do you map kerb slopes when the the slope is in the corner > > the > > > intersection? > > I assume by kerb slope you mean a drop kerb? They are never in the > > corner. Remember the way, when editing, represents the centreline > > so > > they are a few metres into the joining street. This also give > > turning > > vehicles space to stop for pedestrians. > > > Unfortunately, at least around here, they often place the wheelchair > ramp in the corner. My guess is it cost less money. As I said > earlier, using the corner results in 4 instead of 8 ramps on a > typical intersection. A picture of one of these ramps might help. > I'll see if I can dig one up. As I said the corner is not the point where the ways meet, in OSM terms it is at least a lanes width from the that point, a node would work if a suitable router was produced. Phil (trigpoint) _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
