My 2 cents for what it's worth:
Compact snow and ice = studded snow tires
Winter highway driving = studded snow or studded AT tires
Snowy forest roads = AT or studded AT tires
Heavy snow = MT tires
1. Snow tires with a lot of siping (multiple slits) work excellent on compact snow and ice. Check out the tread design of
Nokian Tires, the best snow and ice tires in the world. Add studs and you will have the best for compact snow and ice. However, studded tires are not as safe as non-studded tires on dry pavement because the studs keep the rubber from making full contact with the road. Stopping distances may be longer and cornering may be less secure. We run studded Nokian tires on my wife's Ford Escape and ran them on our Grand Cherokee before that. We live in Yakima and cross Snoqualmie Pass at least once a month and drive into the mountains near Chinook Pass once or twice every month so we see plenty of snow driving. We have not noticed a difference in handling with the Nokian studded tires, but we are OLD and we drive very slow so as not to fall over sideways when we turn the wheel

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2. All terrain tires, such as BFG AT's, work okay on compact snow (not ice) because they have factory siping that allows for better contact between the tire and the snow. The moderately more aggressive tread helps when you get into 6"-8" deep fresh or wet snow. You may want to lower your air pressure, thus allowing for more tread contact with the snow. BFG AT's, as well as some other brands, are built with a 3-ply sidewall that help support the vehicle after you have aired down. We have run BFG AT's year-around on our Grand Cherokee (pre-Nokian), Ford Escape (pre-Nokian) and F150. They are an excellent all-around tire and I highly recommend them for most backroad driving situations. They are not, however, a rain tire. Despite their more aggressive tread design they are just as prone to hydroplaning as a standard highway tread.
2. Deep snow requires a little study. It can be powder and blow away with the mere movement of the vehicle or it can be 3' deep with a frozen crust on top. Too aggressive a tread and you might dig in, too light a tread and you will not get traction. Some guys run nearly bald off-road tires on snow, some run very aggressive tread, it just depends on the circumstances. We run siped MT tires on our modified vehicles and sometimes that works great in the snow and sometimes not so great. We have our tire supplier sipe our MT tires when they are new, i.e. cut slices across the tread.
3. Carry chains for emergencies, but don't plan on using them. Our 97 Grand Cherokee owners manual said, "Do not use tire chains." I suppose they were worried about them tangling up with the brake lines or dinging up the fender wells. We always carried them, but never needed to install them. It would probably be a different story for a modified GC.
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