A friend of my son did the same thing when he first got his license. He had gotten a nice looking Grand Am and was clearly thinking more about how cool his car was than the tractor and wagon ahead of him. Didn't slow down and started to pass and the tractor/wagon started to turn left into a farm. He swerved left missed the tractor and t-boned a large tree. Car was totalled, all the airbags deployed and he was fortunate to walk away with just severe bruising all over his chest and torso.
The only good thing was that he got a second chance. That was 3 years ago and he has been accident-free since then.
I told him then....NEVER just try to pass ANYTHING moving that slow....match the speed first, assess the situation, determine IF it's safe to pass, then when you can see it's safe - do it. And NEVER pass ANYTHING going that slow when there are driveways appraoching on the left.
It's just common sense, but I supppose not many people have that nowadays.
I grew up on a farm and we were right on a state highway with a 55MPH speedlimit. Our second property was about 1 mile down the road but on the opposite side so when going from one to the other you always had to make a left hand turn off of the state highway. After a few close calls we got into the habit of moving left of center about 500 feet before the intersection, that tended to encourage people to drop back in behind us and not try to pass. I was always the person running the grain wagons back and forth and I always worried about someone attepmting a pass just as I turned left into our farm. Fortunately for me it never happened.....