He just runs right over old farm tractor

The dumb *** truck driver was going to kill someone sooner or later. (head up ***)

Tractor driver in this case was asking for it. (probably done this for 30 years)

He is on a divided four lane Highway probably running 15 mph in a 75.

Two dumbs does not equal a right.

Just saying.

Oh and the truck driver is definitely at fault.
Not knowing the stretch, hard to say what's up-road, but personally I'd have been berm rollin' on a tractor there unless there was a culvert/deep ditch comin' up...