The following sentence applies to a situation I am currently mapping (a major freeway is blocked by a collapsed bridge):

• Use the temporary tags for changes that only last for a short period. As an alternative you can use conditional restrictions for road closures.

Unfortunately, I am having some problems:

• Most tools don’t render or otherwise obviously support the draft “temporary:” namespace, I have used it, but I had to add non-temporary access tags to make the data useful to anyone.

• The conditional restrictions syntax depends on the opening hours syntax, which has apparently gone out of its way to disallow specifying specific dates, being overly focused on repeating intervals only. This makes it useless for tagging temporary situations.

So with the current state of the tools it seems impossible to avoid tagging temporary restrictions as if they were permanent, with plenty of explanatory notes and supplemental tags from the temporary scheme.