@Mart Raudsepp 
check the conditional tag

maxspeed=70
maxspeed:conditional=50 @ (07:00-19:00)

I don't see why it was changed though, maybe there was missing speed limit added in some other place and this was made consistent with it.

But I'd prefer if we'd use the one which is both lower and during which more cars pass as the main one for simple data consumers.