He just runs right over old farm tractor

It does appear to be a 4 lane divided highway, but that doesn't change the fact that the truck driver was clearly not paying attention to the surroundings.
When I took the training for my CDL it was constantly drilled into my head to always be aware of everything around me and to watch the road as far ahead as I can see. I have been a commercial driver for almost 35 years now and I see every single day how the standards have continually been lowered. I see farm vehicles on 4 lane divided highways here nearly every day from late March until late October.
There is NO EXCUSE for that collision to have happened, none!