When the road is icy or wet you need traction, the more traction the more grip, the more grip the more control. Some other all-wheel drive systems engage all four wheels only when a loss of traction is detected. By then, your control has already been compromised. Subaru Symmetrical All-Wheel Drive routes power to all four wheels all the time, to help prevent slipping before it happens!
The most important consideration when driving in rain, snow or ice is to reduce your speed. Do not let the Subaru Symmetrical All-Wheel Drive system give you a false sense of security, although it does pose much greater traction than a two wheel drive vehicle there are still limitations in the sense that a tyre can only provide grip up to a certain point, thereafter forces of nature takes over.
Apart from speed reduction also ensure that you increase your following distance to at least three times your normal following distance. This will allow you more time to react in case of emergency situations that may arise while driving.
During harsh braking on snow or icy (dirt roads as well) conditions even your ABS loses some effectiveness due to these slippery and inconsistent and most of the time no traction. When braking, apply the pedal smoothly, ensure you are aware with the optimal braking point of your Subaru.
Smooth steering is even more critical driving in slippery conditions, chances of loosing traction when steering harshly becomes much greater. Applying maximum steering in low grip conditions will not allow your vehicle to change direction more effectively, your vehicle most probably will keep on skidding straight.
In order to react timeously in emergency situations ensure that you extend your observations to as far forward as possible in order to identify possible change in weather, road & traffic conditions well in advance. Some specific conditions are difficult to spot eg large puddles of water on the road surface, black ice, etc
Maximum visibility is important due to visibility outside are reduced due to weather conditions. Make sure you windscreen wipers are in effective operating condition. Ensure that you keep you windscreen clean (inside and outside) and that you prevent your windscreen from fogging.
Your vehicle lights should be in good working condition, clean and kept clean during mud, rain, snow driving in order to ensure visibility, not only for you as driver but also to ensure that other road users can spot your vehicle easily.