Candles can serve multiple purposes and you should have a few in your car. It gets dark early in the winter. No one is going to see you if you’re stranded off of a highway at 10 p.m. and your car battery has died. You have to bring attention to you but you also have to be able to see your surroundings. It’d be great if you could also stay warm somehow. You can use matches to melt snow for water. Candles may produce up to 75 to 85 BTUs per hour.