I was trapped on I-81 a few years ago, when a light dusting turned into the inevitable foot of snow. We were bringing my son up to visit his kids, so we decided to push on. I-81 was a series of accidents involving tractor trailers. Many without any other vehicle involved. All the while, more tractor-trailers pushed up, and then past the accidents, to speed along faster than other traffic by about 15-20 mph. As other vehicles were doing about 25, that created ever more hazardous conditions.
Either the drivers were ALL poorly trained, or suicidal. Several of the more speedy ones were passed in a few miles, piled up against bridge abutments, or tangled in guard rails. After a while, speeds picked up. I'm going to suppose that was due to the lack of remaining "professional truck drivers" left to hold things up.
Yes, passenger vehicles do similarly stupid things in snow, but, the inevitable lowering of standards for truck drivers to become licensed and hired has certainly reduced the inevitability of the automobile driver being the one at fault.
Recently, as detailed here before Christmas, the neighbor was hit by the driver of an Autocar Dump Truck at a light. Two turn lanes, Autocar picked the inside one. When the light turned green, he pulled out. Having such a relatively long wheel-base, he had to pull into her lane to make the turn. In doing so, he struck her just behind the front door, luckily, it was a glancing blow, at low speed. He was unable to judge the path of his truck, or the unseen, but extended, front bumper. Said he'd been driving dump truck for 15 years. Of course, when asked, it was his first time in the companies AutoCar units, which are longer by several feet, then add in that extended front bumper. So much for "professionalism".
Don't get me started on truck drivers who attempt to pass each other on hills, and who do so while going 2 mph faster than the other truck.