I have extensive rural winter driving experience, as well as driving a tow truck in a former life..... the things that I can't stress enough are:
* Keep your distance !! Don't tailgate. With ice and slush, your stopping distances are greatly increased. Also when stopping in a line of traffic, keep a car length ahead of you, and watch your rearview mirror when you are stopped. IF the person behind you underestimates the distance needed to stop, you can take evasive action by moving ahead / or moving to the shoulder etc.
* Drive like there is an egg under the fuel and brake pedal. ( meaning be SMOOTH when accelerating or braking, as well as steering input, don't jerk the wheel ) Remember, winter tires do NOT trump driving like an idiot!!
* Be prepared! Insulated winter boots and snow pants are a necessity in some parts, especially in rural areas. Scarf, winter hat, gloves and good jacket are a MUST. If you have a breakdown, and it's a matter of hours for emergency services to reach you, it's essential that you be prepared. It's no fun freezing, or loosing digits because you never thought you might have issues. A shovel is also a very good idea, even if you never have to use it, as well as booster cables. Think of these things as cheap insurance.
* Keep the fuel tank topped up! Not only will there be less chance of condensation inside the tank from hot / cold cycles ( water in fuel ), you never know when you may have to idle to keep warm, or sit in the event of a highway closure. ( think many hours in the event of a fatality on the highway, or if you have "lost it" and are in the snowbank )
* Keep cash on hand.... you don't want to know how many motorists rely on 'plastic' and don't carry cash. In the event that you need to top up a tank in a rural area ( or pay for other services such as lock out, boost, etc ), and the phone systems are down, so are the credit cards and debit cards. Cash is king people!
* Cell phone, while service is very reliable most of the time, keep in mind there are areas where cell phones will not provide you service. In Northwestern Ontario, with the low population density and rugged terrain, there are many areas that are in the black for service. However, a cell is definitely something to have on hand, keep it charged up, with a charger in the car.