I'm not sure what "most states" you're referring to, but none of them are in this region.
I drive Ohio, Indiana, Michigan, Illinois, Kentucky, Tennessee, Georgia, Mississippi, Virginia, and along New England every week. In none of these states are the semi-trailer speed limits that of a regular passenger vehicle.
Some of you bleeding hearts are all about "but they're people too, they have to pass".
Fuck them. These asshole semi drivers need to stay their ass in the right lane 24/7, even if their "hoss" in front of them is doing 40mph. These assholes have NO consideration for the smaller vehicles on the road, and when they do decide they have to go 56 in a 65 to pass that "hoss" doing 55, they do it by swinging their wide ass about two feet in front of your car while you're doing 70mph. Then you spend the next five minutes reading the same "I'm a safe driver, would you like to be one too? Call Fucktard Logistics, we pay more per mile than everyone else!" on the back of the trailer along with the rocks being flipped into your windshield.
They need stricter laws governing the use and operation of these vehicles. Can they technically be "getting back" at all the years of being mis-treated by asshole drivers cutting them off and swerving past them? Sure. Do they need to be? Not a chance, because their vehicles are a helluva lot more deadly that your average sedan and they know this as well as knowing most people will back down because they'll lose the physical confrontation between vehicles.
It's good to see (at least up and down I-71) the ridiculous amount of OHP enforcement vehicles (dual red lights) nailing these fucks for their bullshit and overloaded trailers.
I hate semi-trucks and their drivers with a passion. I cannot wait until they find some other means in the future to transport goods so these dickheads are off the road.