Maarten Deen wrote:
> Turn restrictions, maximum speeds, oneway streets, even the value 
> of the highway tag is not a geographical fact.

Sure they are.

If I walk about 20 yards from my front door, there's a "no entry" sign at a
certain lat/long. If I walk a bit further along, facing the other way,
there's a "one way" sign at another lat/long. From those two geographical
facts[1], I can deduce that a particular road is oneway. Therefore I tagged
http://www.openstreetmap.org/browse/way/1058809 with oneway=yes. 

Same goes for turn restrictions, maximum speeds, and certainly over here,
highway tags. The one major exception in the OSM database is administrative
boundaries.

cheers
Richard

[1] ok, and also the fact I get shouted at when I cycle up it the wrong way



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