However, if you cannot do that immediately, do not touch the transmission gear. If you're using manual transmission, declutch. Keep your heel on the floor and use your toes to press the brake pedal firmly just short of locking up the wheels. Release the pressure on the pedal, and press again in the same way. Repeat this until you come to a full stop.
Cold weather can put extra stress on the heart and contribute to the hazards of over-exertion.
Sweaty clothes next to the skin are not good insulators against the cold. Stay in the car if you cannot shovel your car out of the snow. Stay in the car in blizzard conditions - Do not leave the car for assistance unless help is visible within about 90 metres or 100 yards. Turn on flashing lights or set up flares. A brightly coloured cloth on the radio antenna may make your vehicle more visible in daylight.