When I lived in New England, the two things were:
Salt
Snow plows
No one who's lived his entire life in Texas, as I had, can understand how much work, and how much capital equipment, is involved in keeping the roads clear and safe to drive on.
Yankees always tell us "you Southerners don't know how to drive in snow" which might be kinda sorta true; but THEIR "knowing how to drive in snow" depends on multi-million dollar investments in plows (those big 'uns that form a phalanx down the freeway are really something to behold); multi-milion dollar investments in salt and salting apparatus, millions of dollars of investments in blowers and small plows operated by individuals under contract to towns and cities; the provision of places to put the removed snow; and the fact that actual ICE as we know it in North Texas is actually quite rare up there. So, yeah, maybe we don't know how to drive in snow, but we're not driving in "snow", we're driving on a thin layer of snow on top of an inch of wet glare ice.
Four wheel drive helps, but not as much as snow tires.
The thing is, no individual, and no municipality, in the South, is going to make Northern level investments (and no Southern taxpayers would stand still for paying for it) to cope with something that happens once or twice a year and melts in three days. When was the last time you saw a genuine snow plow in North Texas? Call up your yard man and tell him you need your driveway plowed. Yeah, right. How many tire stores in North Texas carry real genuine snow tires and a selection of rims? Do you really want to go out there and change to snow tires and back again, two times a year, just in case there's a snow even big enough to merit them? When was the last time you saw an actual snow shovel in a North Texas hardware store? Does Richardson Power Equipment stock snow blowers? Anyone here even heard of the brand "Ariens" that hasn't lived up north?