Florian Lohoff píše v Čt 21. 05. 2009 v 09:21 +0200: > There is no solution other than local survey - everything else is > guessing - and IMHO openstreetmap is a collection of facts not guesses. > So better have no fact than wrong guesses - at least thats true > for maxspeed.
Than why do we have tags like "access=unknown"? It's not a guess, it's just missing information. The legislation says following: "Inside built-up area the speed limit is 50 km/h if not specified otherwise". Creating an area "zone:traffic=XX:in_town" is an exact mirror of this law. > Speedlimit is not like a missing name - Speed kills and we need to be pretty > shure its accurate - Better no speed information at all than a sever broken > one. I dont care if the name is missing but i care whether the speed is > correct. I'd want my navi to either show me the correct speed or that > it doesnt know instead of showing me wrong information 30% of the time. My GPS works different way. If I'm in a town, it does not check the default 50 km/h limit. It only checks those roads, which have a sign regulating the speed. In my proposed model, there must be a "maxspeed" tag on that particular road or a polygon "zone:traffic=XX:residental", which would allow the GPS to start beeping. A polygon "zone:traffic=XX:in_town" does not cause my GPS to check the speed, because the driver must be aware of such regulation anyway. If not, he should not be driving a car at all. But maybe your GPS works different way... > I know its frustrating to see the map grow slowly but better than having > a pile of bullshit nobody cares to look after. My experience is that once > a street is in OSM nobody cares whether the name, maxspeed or something is > correct. So better you be accurate right from the beginning. But this would mean, that GPS units using OSM will be navigating people through 30 km/h residental areas for about... let's guess 10 more years? At least in Czech Republic. This does not seem to me like a big security. Controlling maxspeed limit and doing navigation through cities are anyway two distinct things based on different information. Yours, Radomir Cernoch _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
