[Tagging] symmetrical guardrails

[Volker Schmidt]

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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