One Inch of Snow and School for Tomorrow is Canceled

Me niece had to stop and put chains on for the first time last winter to get through a highway pass. Called us a few minutes after to ask what she's doing wrong since the car was shaking so bad above 50 and dangerous at 60+ and that she'd already stopped several times to make sure she put them on right.
I laughed and asked what the package or manual said about max speed?
-35mph on snow, 25 dry.
But at least she figured it out, and stopped before she flung a chain thru the fender!
Common sense is not all that common anymore, is it?