4WD, AWD, traction control and stability control are very useful features. However, none of them can defy the laws of physics.
If you are driving too fast on slippery ground none of the systems are able to save you. And even if you feel you are already going very slow - you might be too fast for the conditions.
The best safety feature of every car is still the driver
. Be safe! Be Careful! Slow down!