According to WCVB, many cars windshield were shattered from chunks of ice crashing on to them from cars that hadn't cleaned off the roof of their car.

The reporter talked to a woman who was stopped by a State Trooper and given a warning about not cleaning off the roof of her car.  She said that she would have to get up earlier, "even though I'm tired," to have time to clean off the roof of her car.

You have to clean off the snow from your car.  You just have to do it.  Consider it to be an absolute essential, non-negotiable part of your commute.  You wouldn't leave the house without pants, would you?  Consider it that important.  You could really unintentionally hurt someone.  What if it was your relative that got hurt?  You just have to take the time to do it.

I don't know what the people who drive tractor trailers will do.  They MUST have something to use to clean the snow off the top of the rig, don't they?  If they don't, someone needs to make one - NOW.  Before that 18 wheeler smashes another windshield.