Always use caution when driving in snow and on ice. Make sure that you have good mud and snow or All Terrain (AT) tires. When you have to slow down or stop, pump your brakes lightly. Do not slam on your brakes, as this may cause you to skid. If you start to slide, turn
the direction of the slide and brake lightly. If you get stuck in snow or mud, do not race the motor and spin the wheels as you will probably dig a deeper hole. Never travel over 25 miles per hour in snow or ice conditions. Be very cautious of into black ice. If you have ABS brakes, apply gentle pressure. Do not pump!
When moving through snow or over obstacles, if you have any forward motion at all (regardless of how slow it is), keep the vehicle moving. If you start to get stuck, turn your wheels back and forth. This will transfer power to the wheels where you need the traction. Make sure to keep your forward momentum. If you do get stuck, stop and analyze your situation. If you have to put chains on your 4WD vehicle, chain the front wheels.
If you get stuck, dig out around the tires and place your floor mats in front of the tires. Gently rock the vehicle back and forth and turn the steering wheel from side to side until you have traction. Decrease tire pressures to 10 to 20 pounds if necessary for greater traction.
black ice This occurs when rain or melting snow freezes and forms a thin invisible layer of ice over the pavement creating a dangerous icy condition
Source: by Mark A. Smith Mark A. Smith’s Guide to Safe, Common Sense, Off-Road Driving