A whiteout has left you stuck in a snowbank on a rural road, with no help in sight. What does the Driver's Handbook say to do while you wait?

Correct answer: B. Stay with the vehicle, open a window slightly, run the engine sparingly, and use your flashers

Stay with the vehicle, crack a window, and run the engine only sparingly: "If you become stuck or stranded in severe weather, stay with your vehicle for warmth and safety until help arrives. Open a window slightly for ventilation. Run your motor sparingly. Use your emergency flashers." The car is shelter and it is also the thing rescuers can find; a person walking through blowing snow is neither. The window and the sparing use of the engine are both about exhaust — a snow-blocked tailpipe can push carbon monoxide back into the cabin, which is why heat comes in short bursts rather than continuously. This is also the reason the Handbook wants a winter survival kit in the car: warm clothing, non-perishable food, a flashlight, a shovel and a blanket.

Source: MTO Driver's Handbook: Driving at night and in bad weather — Whiteouts, if you become stuck or stranded