Next time you see an SUV in a ditch, check out the tires. I'll bet they are all-season radials. I think that many drivers of SUVs don't bother to put snow tires on, thinking that the 4WD is all they need. I have studded snows on my 4WD F-150 and find them essential up here.
This morning we had about an inch of new snow. On the way to work I'm on the Interstate for about 20 miles (two exits). On that stretch saw three vehicles off the road: a sedan that had hit the guard rail (with new vehicle temp plates), an SUV that was facing the wrong way in the grass median, and a pickup that had flipped and/or rolled into the ditch in the median. That one was ugly, and judging by the mess around the cab the driver didn't walk away. No one is immune to screwing up, stupidity knows no ethnic, social or economic boundaries, and I put a seatbelt on my dog, when he comes in to work with me.
Last rant - ever rent a u-haul truck? There are NO requirements and they tell you NOTHING about driving a truck. I've driven a few mid-sized delivery trucks, and when I moved up here from Jersey I rented a 26-footer. I asked the u-haul guy if I needed anything special to rent it (like a truck license). He said I needed a valid driver's license and a valid credit card. It is scary how many of those trucks are on the road every day, driven by people, who have never driven a truck before in their lives.
Now I will get off of my soap box.