If you have to travel winter roads, have lots of warm clothes, blankets, candles, high energy food, water, and a shovel in your trunk. And make sure you keep your tank topped off as often as possible. A full tank can go a long ways if you’re careful about it, only running the engine and the heater when you really, really need to warm up. Once you do warm up, shut it off and stay under the blankets.
In Indiana, your winter survival car kit is a warm coat, boots, a chocolate bar, and an extra cellphone battery.
Keep a candle, lighter, in an empty coffee can in the cab of the vehicle. Along with other supplies.
PS..make sure the tailpipe is clear of ice and smoke or you will die of CO poisoning!