relax fellas... replacements are coming
as these tires wear they become traction-less... right now they will remove them at 12/32". Last year, last winter these tires were all new and fresh. Going into this winter many units were operating these with 30% or less tread life remaining. Fellas rule number one is protect yourself. Ya gotta check these tires during your pre-trip and when they are worn to the point of the center tread not having any cross grooves left demand they get replaced.
the cross tread are called sipes and the linked video shows how important the cross treads are to our safety