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 may or may not be the same as the city limits. We could even tag these zones with maxspeed, So that when applying we don't have to go and look up what that means. The problem is if the zones overlap, which one applies? Speed limits tend to apply to zones not roads anyway, it just happens that most people only drive on the road. Oh and you will find Speed Limits on railway lines too, but weather any have been entered on OSM yet I'm not sure. Railway Speed limits in the UK seam to be in kph where as roads are in mph which I find a bit strange. Peter. _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
