While most people are members of automobile clubs, if you are headed off the beaten track or up into the mountains at night, it's important to be prepared - especially if you are out of mobile phone range. Always make sure someone knows where you have left from in the morning and where you expect to be at night.
Only keep items in the car that you actually need. There is no need to store your entire wardrobe or something you might need one day, in your car. (Except re-usable shopping bags of course!)