Is it reasonable to expect that well tagged road contains all access tags necessary to check whatever it is accessible?
In other words - is it OK to tag area like proving ground with access=no, without tagging roads on this area with proper access tags? Should cases like this be reported by validators? Or maybe routing engines should be expected to process also areas that share no nodes with processed ways? http://wiki.openstreetmap.org/wiki/Key:access#Nodes.2C_ways_and_areas basically says "do not remove correct access tags", is not answering my question (it is about removing tags, not adding new ones. Also, it is failing to consider that it is possible to ensure adding missing tags by using quality assurance tools). http://wiki.openstreetmap.org/wiki/Computing_access_restrictions is not mentioning areas, maybe because roads should have full set of relevant tags, maybe because it is incomplete. Note: this is not purely theoretical, I encountered it during planning development of JOSM plugin. In my opinion all relevant access tags should be on way and its nodes, otherwise it is unclear whatever road inherits access data from area. Moreover it would make processing data overly complex, but this one may be easily countered that requiring specific access tags would make editing tedious.
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