If you become stranded...
Stay in the vehicle and wait for help. Do not leave the vehicle to search for assistance unless help is visible within 100 yards (91 meters). You can quickly become disoriented and confused in blowing snow.
Display a trouble sign to indicate you need help. Hang a brightly colored cloth (preferably red) on the radio antenna and raise the hood after snow stops falling.
Run the engine occasionally to keep warm. Turn on the engine for about 10 minutes each hour (or five minutes every half hour). Running the engine for only short periods reduces the risk of carbon monoxide poisoning and conserves fuel. Use the heater while the engine is running. Keep the exhaust pipe clear of snow, and slightly open a downwind window for ventilation.
Leave the overhead light on when the engine is running so that you can be seen.
Do light exercises to keep up circulation. Clap your hands and move your arms and legs occasionally. Try not to stay in one position for too long.
If more than one person is in the vehicle, take turns sleeping. If you are not awakened periodically to increase body temperature and circulation, you can freeze to death.
Huddle together for warmth. Use newspapers, maps, and even the removable floor mats for added insulation. Layering items will help trap more body heat.
Watch for signs of frostbite and hypothermia. Severe cold can cause numbness, making you unaware of possible danger.
Drink fluids to avoid dehydration, which can make you more susceptible to the ill effects of cold and to heart attacks.
Avoid overexertion. Cold weather puts an added strain on the heart. Shoveling snow or pushing a vehicle can bring on a heart attack or make other medical conditions worse.