I'm lucky in that I only had one winter driving accident. It was late February about 40 years ago and I was heading home from a local ski resort about 2:00 a.m. in my MG. I was on an expressway, It was drizzling rain and I knew it was kind of slippery so I was only doing about 30 MPH. About a mile ahead I saw lots of flashing lights and knew what had happened so I immediately took my foot off the accelerator pedal and started to slowly guide my car off the highway and onto the snow covered shoulder. Didn't matter how cautions I was, my car slid sideways off the road and slid right up a guard rail with my front wheels hanging over it.......
That "kind of slippery" was the worst black ice I've ever witnessed, it was almost as if a zamboni had gone thru there and smoothed it out.
The tow trucks were busy that night.
We once spun off the road when I let my foot off the gas on an icy overpass... wrong thing to do in a front wheel drive car. Luckily we didn’t hit anything.