Am Wednesday 20 May 2009 schrieb Peter Childs: > 2009/5/20 Jacek Konieczny <jaj...@jajcus.net>: > > On Wed, May 20, 2009 at 11:59:05AM +0100, Radomir Cernoch wrote: > >> In the Czech list we ended up with the following solution, which tries > >> to copy the legislation (which is a good starting point, I guess): > >> > >> 1) Every road is by default 'rural' road (speed limit 90 km/h). > >> 2) Every highway has speed limit 130 km/h by default. > >> 3) If a road is inside a polygon tagging the city limits, > >> then its speed limit is set to 50 km/h. Such polygon might be tagged > >> by 'place', but the actual name of the tag is not important here. > >> 4) If a road has different speed limit from rules 1) - 3), it is tagged > >> with 'maxspeed=...'. > > > > That would not work very well in Poland. Town/city/village > > administrative border usually differ from the "built up zone" borders. > > Often one driving through a city will pass one "start of the place" sign > > (with place name) and several times "start of built up zone" and "end of > > built up zone" before the "end of the place" sign. So we would need > > different polygons for built up zones than for place administrative > > boundaries (which are IMHO not less important, unless we want OSM be > > a road map only). > > > > Greets, > > Jacek > > Could we not have different polygons for Speed Limited Zones. > that was one of the first ideas on the german list, too. but the zones (at least in germany) imply besides the maxspeed also other things like parking restrictions, minimum possible speed and the like, so a more general zone tag would be better...
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