On Friday 13 June 2008 03:54:42 Frederik Ramm wrote: > Hi, > > > If there is some legal reason for it to be only accessible by bikes and > > tractors, then you'll need to use access restrictions > > (access=no;agriculture=yes;bicycle=yes;foot=yes) anyway, as there is > > nothing that says normal cars are not allowed to use tracks of grade1 > > I don't know if this is a German specialty but the tracks being > discussed mainly carry the following sign disallowing all motorized > traffic: > > http://de.wikipedia.org/wiki/Bild:Zeichen_260.svg > > And then the following exemption explicitly allowing > agricultural/forestry use: > > http://de.wikipedia.org/wiki/Bild:Zusatzzeichen_1026-38.svg > > Surely it is possible to tag these ways as > access=no,agriculture=yes,forestry=yes,bicycle=yes,horse=yes,foot=yes > etc.etc. but it seems wrong to me; the signage *forbids* certain > accesses and allows all others. You are suggesting to turn around the > logic with your tagging: Forbid all accesss and then explicitly allow > some. Which obviously breaks if new access types are introduced later.
I'm doing exactly what you want to do. Except I was thinking about the following sign: http://de.wikipedia.org/wiki/Bild:Zeichen_250.svg The closest tag I know for this is access=no, unless you want to invent the new tag vehicles=no > What's more, in terms of kilometres we have vastly more of these in > Germany than, say, pedestrian zones in cities. Nobody says that we > should do away with highway=pedestrian even though you could perfectly > well tag it as highway=residential,access=no,foot=yes - pedestrian areas > are something that is known to everyone and so we just tag "here is a > pedestrian area" instead of trying to describe what exactly a pedestrian > area is. > > So it is only understandable that the community is looking for an easy > way to tag these kinds of tracks, and until now many seem to have used > highway=track,tracktype=grade1 for them. Maybe many have discussed this implicit access restriction on the German mailinglist. But I have seen nothing about it in the wiki nor in the talk list. So from my (Dutch) viewpoint there are no implicit access restrictions on a grade1 track. In contrary the very definition of it implies it is physically possible to drive a normal car along it. For a pedestrian highway however the implicit access restrictions are clearly defined and worldwide the same. > Maybe we should simply stop trying to find international lingo for > something that seems to be a national type of road, and just recommend > that people tag these things as "highway=land-und-forstwirtschaft", with > implied access restrictions. That is probably a better idea than to expect any routing program to know that when a track of grade1 is in Germany it has different access restrictions then in e.g. the Netherlands. -- m.v.g., Cartinus _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
