Hi, the whole idea of polygons is over anyway... So my only answer to your points is "yes". :-)
Radek 2009/5/23 Lauri Kytömaa <[email protected]>: > Radomir Cernoch wrote: >>> http://openstreetmap.org/?lat=60.18933&lon=24.9642&zoom=18 >>I do not >>think that streets like Sturenkatu or Teollisuuskatu, nor any of >>connected primary/secondary/tertiary form a "zone". I would suggest to >>define a "zone" as an "area with predominantly uniform traffic >>regulations". > > Not that it matters in Finland, but urban roads are more often signposted > as "zone 30" or "zone 40" and not "maxspeed 30/40", at least in Helsinki. > Such zones can't be made up at will, but can only be surveyed by entering > an area from all directions. To me the maxspeed is just a property of the > road, even if the authorities have signed them as a maxspeed zone. > > Likewise the urban area (as defining the applying traffic rules, mainly > maxspeed=50/80) can't be accurately deduced from landuse areas, > residential roads nor from any administrative boundaries yet entered. The > only relevant legislative differences are the maxspeed and whether honking > is allowed to signal starting an overtake, but no one does that anyway. > > Examples: > in http://openstreetmap.org/?lat=60.221&lon=25.035&zoom=16 > everything is urban, but > in http://openstreetmap.org/?lat=60.193&lon=25.03&zoom=16 > only the trunk road is not urban (as are all trunk roads inside Helsinki) > >>* If someone forgets to add the "maxspeed" or "zone:traffic" tag to a >> road, this model is closer to reality. (Please note that this may >> happen in a very well made map, see my previous "Helsinki" mail). > > Actually, if there was a polygon with zone:traffic, it'd likely be wrong. > Those roads most likely have a maxspeed of 30 or 40 and without a proper > survey(*1) they would still be inside a zone:traffic=urban, which would > imply a maxspeed 50 in Finland. Guessing a zone from the other minor > roads, roads that aren't connected to those without a maxspeed > (Allotriankuja and Rialtonkuja in the example), would indicate a maxspeed > zone of 30 or 40 - a 50 percent probability of being wrong. Without a > given maxspeed it's known to contain incomplete information. > > *1 Someone unkown drew most of the roads in Helsinki in 2007 from the > Yahoo aerials and there's still much to add details to. A chance to get > the house numbers, too. It's a work in progress, even if it looks quite > detailed in places. > > With about 600 mappers (ever having edited anything) in Finland and 300 > 000 km of roads it's going to take a whole lot of time, esp. outside the > significant cities. > > -- > Alv > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk > -- Radomir Cernoch +44 750 708 8293 / +420 607 282 031 Email, Jabber: [email protected] _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
