Somebody shot video of a woman in Canada driving in the next lane of a busy freeway, and she's using a scraper to clean the snow off of her windshield.
She has one hand on the steering wheel, and the other hand is outside trying to scrape off the snow. She's going about 40 miles-an-hour, and can barely see because there's so much snow packed onto the windshield.
At one point she slows down and stops right in the middle of the road. Fortunately, the car behind her stopped too.
It just goes to show that you need to clean the snow off the roof of your car too because it could slide down onto your windshield - which could be the case here....