@Agasthène: thanks for helping but I’m not sure we are talking about the same thing.

We know what a schoolstreet is and how to tag it in OSM.

But the reality is that every schoolstreet in the Brussels Region is different: they negociate different hours, some streets are only closed in the morning, some morning+afternoon, and there are different times on Wednesdays.  And most importantly: schoolstreets are sometimes announced on official websites… and not effective.