Am Wednesday 20 May 2009 schrieb Radomir Cernoch: > Hi, > > I would like to ask about the proposed feature 'trafficzone'. If I > understand it right, it proposes to add a tag to _every_ highway and > _every_ road in the city. I'm afraid that this solution is highly > redundant in the amount of information and therefore it's likely that > someone will forgot to add the right tag. > yes, this may be redundant, but I think it's the easiest way to tag and use these values. the other possibilities would be creating a polygon or a relation, but this seems to be rather complex to map and to use...
> 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): > right. > 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=...'. > sounds reasonable... > By this scheme it's easy to set the speed limits right very quickly on > most roads, because it only requires to add the polygon with 'place' tag > (or any other name we agree on). At the same time you can set the speed > limits as detailed as you want to. > ...but you would need some kind of gis database/functions to evaluate the polygon data. the easy way of reading just keys and values like with most of the other features in the osm database would not be possible.
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