[CrazyIvan]

4W drive vehicles may get better traction on snow packed roads but braking is no different than 2W drive.

I drive a Wrangler with limited slip rear axle, auto locker front axle and excellent tires. It will go through about anything but won't stop an inch shorter than an ordinary car on ice. Four times zero is still zero.

[TruthWillWin]

True. The only thing that helps braking on ice or packed snow is studed tires.