Doubt if they'll enforce it on truckers. I have yet to see a MO HP pull over a trucker for speeding. The scenario you described is common--and absolutely chilling. It has led to the death of more than one new driver.
For that reason, I've been taking 231 instead of the interstate....Have noticed that the trucks actually speed up when they hit Indy (either on 65 or 465) then slow back down in the rural areas....Must be common knowledge among the truckers that they're safe in "race town".