The wiki page http://wiki.openstreetmap.org/wiki/Tag:barrier%3Dguard_rail says: "If there is a clear inner/outer demarcation to the guard rail, construct the line so that the *right side is inner* and *left side is outer*." Often you find perfectly symmetric guardrails (example: http://www.mapillary.com/map/im/9-9-x8ynIiIdpNQHeA5CWg)
I would like to tag this fact. Any examples or suggestions?
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