Your street-parked car is covered with six inches of last night’s snow and you’re running late for work.
It will take at least five minutes to properly clear your car of snow and ice, so you decide to cut corners and clear off just enough to see through the windows. The roof? Pfft. That snow is not in the way.
If you made that decision, it’s a bad one — even if it reduces the likelihood of an icy stare from your boss. That snow can slide or blow backward or forward, obstructing your view. It can fly off and endanger others.