re: Pass-me-on-the-left (of 2 lane Hwy) while-I-have-my-left-blinker-on-guy

More detail-I'm on a 2 lane hwy (south walker road), going maybe 5 miles over the speed limit , starting to slow to turn left into subdivision on left with my turn signal on, truck comes up behind me doing maybe 80 in a 55,and passes on the left. Had I not anticipated it, he would have hit us broadside and killed me and four kids, and himself. As it was he almost hit a truck coming the other way. Single dumbest Darwin-testing human I have ever seen IRL.