I'm editing a residential area in the US that has many sidewalks (tagged as highway=footway) with curb cuts (sloped curbs) allowing access to the road. In a number of locations these curb cuts come in pairs, and what I do to link them is create a way tagged highway=crossing between them. I use 5 nodes, two nodes in common with the footway/sidewalk, one node in common with the road, and one node on each of the curb cuts (which are tagged sloped_curb=yes).

My question is what to do if I don't have a pair of curb cuts, but simply access to the road itself (near parking). Tagging the way as highway=crossing doesn't seem appropriate, but neither does highway=footway. I will do three nodes for the ways, one in common each with the road and the footway, and one for the curb cut.

A related question is what to do when I have multiple curb cuts near each other. Crossings between each of them doesn't make sense to me, since it's a residential road people can cross between any of them, including diagonally. Should I just connect to a common node on the road?

asked 22 Sep '10, 12:39

joshdoe's gravatar image

accept rate: 0%

edited 26 Sep '10, 10:34

Jonathan%20Bennett's gravatar image

Jonathan Ben...

As noted in the selected answer, I shouldn't have tagged the way with highway=crossing.

(11 Aug '11, 17:23) JoshD

This question is not easy to answer since mapping sidewalks, sloped curbs and crossings are called "micro-mapping" and are not extensively surveyed in OSM at the moment. So you are free to innovate or try to contact other people interested by the same level of details by other means like IRC or the OSM mailing lists (see Contact on the wiki) because at the moment, we don't have well established practices about these detailed things.
But "highway=crossing" seems to be designed for the intersection node between the footway and the highway , see the wiki : http://wiki.openstreetmap.org/wiki/Tag:highway%3Dcrossing and http://wiki.openstreetmap.org/wiki/Crossing. So the way crossing the road should be tagged with highway=footway, like the sidewalks and the crossing tag only on the intersection node itself. Tagging sloped curbs has been proposed on the wiki : http://wiki.openstreetmap.org/wiki/Proposed_features/sloped_curb and you can follow the discussion there. But your method to set them on two specific nodes seems to be the most accurate.
The question about linking footways and roads outside sloped curbs is a general question about how far we want to symbolize entities in OSM (a polyline for a sidewalk or road where we should draw a polygon) and how far we want to draw ourselves all interconnections, especially for pedestrians which is much more complexe than for cars in order to help routing applications for pedestrians. Such applications for OSM should be able to find a route even when sidewalks are not represented (since the vast majority of them are missing) and even allow road crossing at the best for the shortest way even if crossing's are missing (but better use them if one can be found nearby).

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answered 24 Sep '10, 13:48

Pieren's gravatar image

accept rate: 15%

edited 27 Sep '10, 09:14

Thanks for the great response. I'm glad you caught my error about tagging of the way as a crossing rather than just the node.

For my question, I think I'd say the way should be tagged as highway=footway, with no special tag for the node where it intersects with the road.

(27 Sep '10, 15:08) joshdoe

Here's what I do now. I tag such "links" with highway=footway and footway=crossing, which indicates it's not a physical strip of asphalt/concrete dedicated to pedestrians, but it's part of another highway. However, I don't add a highway=crossing node where it intersects the road.

For the second part, if there are dropped kerbs (aka curb cuts) on four corners of an intersection, I essentially draw a box connecting them, so I ignore the possibility of diagonal crossings, as that's typically not allowed or at least it's unusual to do so. Of course there are some cities which have such diagonal crossings, and those should be marked as such in that case. See this image on the wiki for how I would map this type of situation (though for three kerbs rather than four).

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answered 11 Aug '11, 17:24

JoshD's gravatar image

accept rate: 11%

edited 11 Aug '11, 17:28


It does not really answer the question but at that level of detail it seem to be appropriate to tag the footway/streeet areas in some way (landuse=street has been suggested)

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answered 11 Aug '11, 19:50

LM_1's gravatar image

accept rate: 10%


The links are necessary for routing, while landuse=street or area:highway=* tags for the area would only be useful for rendering or perhaps some analysis (% of earth covered by asphalt?).

(11 Aug '11, 20:28) JoshD

Yes, they would be useful for rendering, or analysis. Also they can give you the information where the sidewalk ends and street starts. They give you the information about actual shape of the street (eg. oversized load can go over a sidewalk, but not through a house). You can find more uses. I am only saying that when you survey the area this deep, you can draw it to the map...

(11 Aug '11, 20:39) LM_1
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question asked: 22 Sep '10, 12:39

question was seen: 5,166 times

last updated: 11 Aug '11, 20:39

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