Changed the subject since that question forks in another direction.
As with other temporary restrictions (blocked roads, speed limits), first some discretion should be applied how long the restriction will last and if it is worthwhile to be mapped (e.g. years yes, days no) Secondly the start and prospective end date should be noted so that somebody else can clear it if the restriction is gone. There is a proposal for temporary features here: https://wiki.openstreetmap.org/wiki/Proposed_features/temporary (as said above I would not support to map short-time events as in the proposal's example of a 6 hour demonstration) tom John F. Eldredge wrote on 2014-10-27 01:55:
Speaking of "permanent structures", is there a recommended way of tagging a maxheight that is temporarily lower, such as when scaffolding is erected under a bridge for painting or repairs?
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