If top, middle, bottom have a meaning for the OP, I'm not sure it's really general, counter-examples have been given. To avoid confusion with elevation, what would be another way to tag them? Motor position have been given, but it is not really relevant for the common user. For routing aerialway:access and the connection to a piste:type=downhill start (or whatever) may be sufficient. What is the use case here? Yves
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