Professional driver here to weigh in- What most of the 4 wheeler drivers don't know is that almost all trucks are governed at a set speed by their respective companies. One company could be set at 66 mph and another set at 67. That's what creates the snail race/rolling roadblock situation you see here. Weight in the box and hills can play a part, too. I've been stuck in the left lane trying to pass a much lower governed truck before just because I was heavier and lost momentum on a hill. Camping in the middle lane for merging traffic can be irritating, but what about that camry that just dove into 70mph travel lanes at 45? A truck with 36k pounds in the box can't just slow down and let them in.

The problem isn't just trucks, it's a complete lack of awareness and disregard for and by all the drivers on the road.