I've been researching the way auxiliary lanes (right/left turn, etc.) are tagged in OSM but I can't tell if there's an accepted standard for handling these. There are a number of competing proposals for different scenarios and nothing seems to cover all cases.
<http://wiki.openstreetmap.org/wiki/Key:turn> Key:turn <http://wiki.openstreetmap.org/wiki/Key:turn> appears to be pretty widely used but I don't see anything in there about the commonly used center turn lane <http://mutcd.fhwa.dot.gov/htm/2009/part3/fig3b_07_longdesc.htm> here in the US. So I guess I have two questions: 1. Is there an accepted standard for handling auxiliary lanes? 2. Is there a common way for US mappers to tag the center turn lane? Thanks, Spencer
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