RWD will yaw more if you lose traction on one wheel and not the other, especially when in a mild turn or straightaway. FWD will yaw less, but is more likely to spin the back end going around a turn from inertia if traction is lost. RWD cars have a better distribution of weight, but if overdriven on a turn the back wheels can lose traction completely and (you guessed it) spin the back end going around a turn. Each has advantages and disadvantages. I've seen vehicles of all sorts spin out, spin their wheels, get stuck, etc. I know people who can drive RWD vehicles just fine under the worst conditions imaginable when FWD cars are spinning out and piling up. The best thing you can do with either vehicle in icy conditions is slow down, or avoid driving at all. You can't fight physics. FWD or even 4WD is NOT carte blanche to overdrive the conditions. Best to play it safe - slow down.
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