I voted driving too fast. It's annoying because every time I drive on highway, I always see SUV or cars driving too fast and they ended up spinning and plowed into the median or shoulder!!! What a dumb driver. Rule of thumb are that when it's snowing out and snow on the road, DRIVE 35mph MAXIMUM on Highway!! I have always known that when it's snow or icy out there, it's a simple common sense that one must slow down to allow car to get a grip of the road and drive safely.
I've seen twice that SUV spun and went down on very deep shoulder (deep shoulder with cliff wall) front first with rear end standing up. I can see its rear axle.
Often, people who moved in Kansas from Pacific, Atlantic from South are prone to have accidents because they are not familiar with Kansas' harsh weather. Kansas/Missouri weather tend to frequently icy. Because temperature drops 30 degree when it become night. Once in a while it does drops 40 degree.
In fact.. I drove my 1967 Chevy C-10 long bed pickup truck to work during icy weather at night. I DIDN'T EVEN HAVE SANDBAG or ANY weights. I had no problem getting to work. Only 6 people showed up that night which typically supposed to be over 20 people. Two weeks later, I was awarded $50 for showing up work on icy weather that paralized Kansas City. That was back then in 1992 hee hee. Many of my co worker were pissed cuz they didn't get cash award, just cup, watch or shirt that's all.
Catty