Here's a little glitch I discovered years ago when the first front-wheel drives came out (applies to rear-wheel too, but not quite as bad).
When you're trying to stop on an icy road, the engine wants to keep the wheels turning, and it makes it harder to brake effectively. One pair of wheels can lock while the others don't, and that's bad for control. If it's a manual, disengage the clutch, if its an automatic, pop it into neutral -- that way the brakes are much better at applying even braking pressure to all four wheels, and you'll come to a stop a little sooner, and without losing control.
You won't want to go very far with chains on unless there's two feet of unplowed snow on the road (unlikely), and you won't need them. But snow tires are a definite advantage (there's no such thing as an all-season) -- they can get you stopped (and started) more effectively than summers or all-seasons.
Last winter, on a ski trip, my 4-wheel drive sidekick was the only one of about 20 4wd vehicles that made it up a steep, snow-covered road to access a good ski trail. It was also the only 4wd that had snow tires on all 4 wheels. Four wheel drive by itself is no panacea -- connecting the engine to all 4 wheels does nothing to improve the traction on the ground. In fact -- an idiot in a 4wd drive is way more dangerous than the same idiot behind the wheel of a 2wd, because he can get the 4wd up to a good rate of speed before he realizes that his stopping ability hasn't changed one iota.
Have a good trip
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