Are ref:forward and ref:backward valid tags for use? Though only existing in short, isolated instances, there are many segments of road where a route only follows one direction of a way, and some where another route follows only the other direction, such as at a complex route junction. Are ref:forward and ref:backward an acceptable way to tag these situations, or is tagging it as a full concurrency and relying on relation roles the only way to go here?
--Roadsguy
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